﻿/*!
 * FullCalendar v2.1.0
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */

/*!
 * FullCalendar v2.1.0
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */

import moment from 'moment';

var defaults = {
  firstLoading: true,
  lang: 'en',

  defaultTimedEventDuration: '02:00:00',
  defaultAllDayEventDuration: { days: 1 },
  forceEventDuration: false,
  nextDayThreshold: '09:00:00', // 9am

  // display
  defaultView: 'month',
  aspectRatio: 1.35,
  header: {
    left: 'title',
    center: '',
    right: 'today prev,next',
  },
  weekends: true,
  weekNumbers: false,

  weekNumberTitle: 'W',
  weekNumberCalculation: 'local',

  //editable: false,

  // event ajax
  lazyFetching: true,
  startParam: 'start',
  endParam: 'end',
  timezoneParam: 'timezone',

  timezone: false,

  //allDayDefault: undefined,

  // time formats
  titleFormat: {
    month: 'MMMM YYYY', // like "September 1986". each language will override this
    week: 'll', // like "Sep 4 1986"
    day: 'LL', // like "September 4 1986"
  },
  columnFormat: {
    month: 'ddd', // like "Sat"
    week: generateWeekColumnFormat,
    day: 'dddd', // like "Saturday"
  },
  timeFormat: {
    // for event elements
    default: generateShortTimeFormat,
  },

  displayEventEnd: {
    month: false,
    basicWeek: false,
    default: true,
  },

  // locale
  isRTL: false,
  defaultButtonText: {
    prev: 'prev',
    next: 'next',
    prevYear: 'prev year',
    nextYear: 'next year',
    today: 'Today',
    month: 'M',
    week: 'W',
    day: 'D',
  },

  buttonIcons: {
    prev: 'left-single-arrow',
    next: 'right-single-arrow',
    prevYear: 'left-double-arrow',
    nextYear: 'right-double-arrow',
  },

  // jquery-ui theming
  theme: false,
  themeButtonIcons: {
    prev: 'circle-triangle-w',
    next: 'circle-triangle-e',
    prevYear: 'seek-prev',
    nextYear: 'seek-next',
  },

  dragOpacity: 0.75,
  dragRevertDuration: 500,
  dragScroll: true,

  //selectable: false,
  unselectAuto: true,

  dropAccept: '*',

  eventLimit: false,
  eventLimitText: 'more',
  eventLimitClick: 'popover',
  dayPopoverFormat: 'LL',

  handleWindowResize: true,
  windowResizeDelay: 200, // milliseconds before a rerender happens
};

function generateShortTimeFormat(options, langData) {
  return langData
    .longDateFormat('LT')
    .replace(':mm', '(:mm)')
    .replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs
    .replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand
}

function generateWeekColumnFormat(options, langData) {
  var format = langData.longDateFormat('L'); // for the format like "MM/DD/YYYY"
  format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, ''); // strip the year off the edge, as well as other misc non-whitespace chars
  if (options.isRTL) {
    format += ' ddd'; // for RTL, add day-of-week to end
  } else {
    format = 'ddd ' + format; // for LTR, add day-of-week to beginning
  }
  return format;
}

var langOptionHash = {
  en: {
    columnFormat: {
      week: 'ddd M/D', // override for english. different from the generated default, which is MM/DD
    },
    dayPopoverFormat: 'dddd, MMMM D',
  },
};

// right-to-left defaults
var rtlDefaults = {
  header: {
    left: 'next,prev today',
    center: '',
    right: 'title',
  },
  buttonIcons: {
    prev: 'right-single-arrow',
    next: 'left-single-arrow',
    prevYear: 'right-double-arrow',
    nextYear: 'left-double-arrow',
  },
  themeButtonIcons: {
    prev: 'circle-triangle-e',
    next: 'circle-triangle-w',
    nextYear: 'seek-prev',
    prevYear: 'seek-next',
  },
};

var fc = ($.fullCalendar = { version: '2.1.0' });
var fcViews = (fc.views = {});

$.fn.fullCalendar = function (options) {
  var args = Array.prototype.slice.call(arguments, 1); // for a possible method call
  var res = this; // what this function will return (this jQuery object by default)

  this.each(function (i, _element) {
    // loop each DOM element involved
    var element = $(_element);
    var calendar = element.data('fullCalendar'); // get the existing calendar object (if any)
    var singleRes; // the returned value of this single method call

    // a method call
    if (typeof options === 'string') {
      if (calendar && $.isFunction(calendar[options])) {
        singleRes = calendar[options].apply(calendar, args);
        if (!i) {
          res = singleRes; // record the first method call result
        }
        if (options === 'destroy') {
          // for the destroy method, must remove Calendar object data
          element.removeData('fullCalendar');
        }
      }
    }
    // a new calendar initialization
    else if (!calendar) {
      // don't initialize twice
      calendar = new Calendar(element, options);
      element.data('fullCalendar', calendar);
      calendar.render();
    }
  });

  return res;
};

// function for adding/overriding defaults
function setDefaults(d) {
  mergeOptions(defaults, d);
}

// Recursively combines option hash-objects.
// Better than `$.extend(true, ...)` because arrays are not traversed/copied.
//
// called like:
//     mergeOptions(target, obj1, obj2, ...)
//
function mergeOptions(target) {
  function mergeIntoTarget(name, value) {
    if ($.isPlainObject(value) && $.isPlainObject(target[name]) && !isForcedAtomicOption(name)) {
      // merge into a new object to avoid destruction
      target[name] = mergeOptions({}, target[name], value); // combine. `value` object takes precedence
    } else if (value !== undefined) {
      // only use values that are set and not undefined
      target[name] = value;
    }
  }

  for (var i = 1; i < arguments.length; i++) {
    $.each(arguments[i], mergeIntoTarget);
  }

  return target;
}

// overcome sucky view-option-hash and option-merging behavior messing with options it shouldn't
function isForcedAtomicOption(name) {
  // Any option that ends in "Time" or "Duration" is probably a Duration,
  // and these will commonly be specified as plain objects, which we don't want to mess up.
  return /(Time|Duration)$/.test(name);
}
// FIX: find a different solution for view-option-hashes and have a whitelist
// for options that can be recursively merged.

//var langOptionHash = {}; // initialized in defaults.js
fc.langs = langOptionHash; // expose

// Initialize jQuery UI Datepicker translations while using some of the translations
// for our own purposes. Will set this as the default language for datepicker.
// Called from a translation file.
fc.datepickerLang = function (langCode, datepickerLangCode, options) {
  var langOptions = langOptionHash[langCode];

  // initialize FullCalendar's lang hash for this language
  if (!langOptions) {
    langOptions = langOptionHash[langCode] = {};
  }

  // merge certain Datepicker options into FullCalendar's options
  mergeOptions(langOptions, {
    isRTL: options.isRTL,
    weekNumberTitle: options.weekHeader,
    titleFormat: {
      month: options.showMonthAfterYear
        ? 'YYYY[' + options.yearSuffix + '] MMMM'
        : 'MMMM YYYY[' + options.yearSuffix + ']',
    },
    defaultButtonText: {
      // the translations sometimes wrongly contain HTML entities
      prev: stripHtmlEntities(options.prevText),
      next: stripHtmlEntities(options.nextText),
      today: stripHtmlEntities(options.currentText),
    },
  });

  // is jQuery UI Datepicker is on the page?
  if ($.datepicker) {
    // Register the language data.
    // FullCalendar and MomentJS use language codes like "pt-br" but Datepicker
    // does it like "pt-BR" or if it doesn't have the language, maybe just "pt".
    // Make an alias so the language can be referenced either way.
    $.datepicker.regional[datepickerLangCode] = $.datepicker.regional[langCode] = // alias
      options;

    // Alias 'en' to the default language data. Do this every time.
    $.datepicker.regional.en = $.datepicker.regional[''];

    // Set as Datepicker's global defaults.
    $.datepicker.setDefaults(options);
  }
};

// Sets FullCalendar-specific translations. Also sets the language as the global default.
// Called from a translation file.
fc.lang = function (langCode, options) {
  var langOptions;

  if (options) {
    langOptions = langOptionHash[langCode];

    // initialize the hash for this language
    if (!langOptions) {
      langOptions = langOptionHash[langCode] = {};
    }

    mergeOptions(langOptions, options || {});
  }

  // set it as the default language for FullCalendar
  defaults.lang = langCode;
};
function Calendar(element, instanceOptions) {
  var t = this;

  // Build options object
  // -----------------------------------------------------------------------------------
  // Precedence (lowest to highest): defaults, rtlDefaults, langOptions, instanceOptions

  instanceOptions = instanceOptions || {};

  var options = mergeOptions({}, defaults, instanceOptions);
  var langOptions;

  // determine language options
  if (options.lang in langOptionHash) {
    langOptions = langOptionHash[options.lang];
  } else {
    langOptions = langOptionHash[defaults.lang];
  }

  if (langOptions) {
    // if language options exist, rebuild...
    options = mergeOptions({}, defaults, langOptions, instanceOptions);
  }

  if (options.isRTL) {
    // is isRTL, rebuild...
    options = mergeOptions({}, defaults, rtlDefaults, langOptions || {}, instanceOptions);
  }

  // Exports
  // -----------------------------------------------------------------------------------

  t.options = options;
  t.render = render;
  t.destroy = destroy;
  t.refetchEvents = refetchEvents;
  t.reportEvents = reportEvents;
  t.reportEventChange = reportEventChange;
  t.rerenderEvents = renderEvents; // `renderEvents` serves as a rerender. an API method
  t.changeView = changeView;
  t.select = select;
  t.unselect = unselect;
  t.prev = prev;
  t.next = next;
  t.prevYear = prevYear;
  t.nextYear = nextYear;
  t.today = today;
  t.gotoDate = gotoDate;
  t.incrementDate = incrementDate;
  t.zoomTo = zoomTo;
  t.getDate = getDate;
  t.getCalendar = getCalendar;
  t.getView = getView;
  t.option = option;
  t.trigger = trigger;
  t.exit = exit;

  // 单页应用bug，防止第二次不加载
  function exit() {
    defaults.firstLoading = true;
  }

  // Language-data Internals
  // -----------------------------------------------------------------------------------
  // Apply overrides to the current language's data

  // Returns moment's internal locale data. If doesn't exist, returns English.
  // Works with moment-pre-2.8
  function getLocaleData(langCode) {
    var f = moment.localeData || moment.langData;
    return f.call(moment, langCode) || f.call(moment, 'en'); // the newer localData could return null, so fall back to en
  }

  var localeData = createObject(getLocaleData(options.lang)); // make a cheap copy

  if (options.monthNames) {
    localeData._months = options.monthNames;
  }
  if (options.monthNamesShort) {
    localeData._monthsShort = options.monthNamesShort;
  }
  if (options.dayNames) {
    localeData._weekdays = options.dayNames;
  }
  if (options.dayNamesShort) {
    localeData._weekdaysShort = options.dayNamesShort;
  }
  if (options.firstDay != null) {
    var _week = createObject(localeData._week); // _week: { dow: # }
    _week.dow = options.firstDay;
    localeData._week = _week;
  }

  // Calendar-specific Date Utilities
  // -----------------------------------------------------------------------------------

  t.defaultAllDayEventDuration = moment.duration(options.defaultAllDayEventDuration);
  t.defaultTimedEventDuration = moment.duration(options.defaultTimedEventDuration);

  // Builds a moment using the settings of the current calendar: timezone and language.
  // Accepts anything the vanilla moment() constructor accepts.
  t.moment = function () {
    var mom;

    if (options.timezone === 'local') {
      mom = fc.moment.apply(null, arguments);

      // Force the moment to be local, because fc.moment doesn't guarantee it.
      if (mom.hasTime()) {
        // don't give ambiguously-timed moments a local zone
        mom.local();
      }
    } else if (options.timezone === 'UTC') {
      mom = fc.moment.utc.apply(null, arguments); // process as UTC
    } else {
      mom = fc.moment.parseZone.apply(null, arguments); // let the input decide the zone
    }

    if ('_locale' in mom) {
      // moment 2.8 and above
      mom._locale = localeData;
    } else {
      // pre-moment-2.8
      mom._lang = localeData;
    }

    return mom;
  };

  // Returns a boolean about whether or not the calendar knows how to calculate
  // the timezone offset of arbitrary dates in the current timezone.
  t.getIsAmbigTimezone = function () {
    return options.timezone !== 'local' && options.timezone !== 'UTC';
  };

  // Returns a copy of the given date in the current timezone of it is ambiguously zoned.
  // This will also give the date an unambiguous time.
  t.rezoneDate = function (date) {
    return t.moment(date.toArray());
  };

  // Returns a moment for the current date, as defined by the client's computer,
  // or overridden by the `now` option.
  t.getNow = function () {
    var now = options.now;
    if (typeof now === 'function') {
      now = now();
    }
    return t.moment(now);
  };

  // Calculates the week number for a moment according to the calendar's
  // `weekNumberCalculation` setting.
  t.calculateWeekNumber = function (mom) {
    var calc = options.weekNumberCalculation;

    if (typeof calc === 'function') {
      return calc(mom);
    } else if (calc === 'local') {
      return mom.week();
    } else if (calc.toUpperCase() === 'ISO') {
      return mom.isoWeek();
    }
  };

  // Get an event's normalized end date. If not present, calculate it from the defaults.
  t.getEventEnd = function (event) {
    if (event.end) {
      return event.end.clone();
    } else {
      return t.getDefaultEventEnd(event.allDay, event.start);
    }
  };

  // Given an event's allDay status and start date, return swhat its fallback end date should be.
  t.getDefaultEventEnd = function (allDay, start) {
    // TODO: rename to computeDefaultEventEnd
    var end = start.clone();

    if (allDay) {
      end.stripTime().add(t.defaultAllDayEventDuration);
    } else {
      end.add(t.defaultTimedEventDuration);
    }

    if (t.getIsAmbigTimezone()) {
      end.stripZone(); // we don't know what the tzo should be
    }

    return end;
  };

  // Date-formatting Utilities
  // -----------------------------------------------------------------------------------

  // Like the vanilla formatRange, but with calendar-specific settings applied.
  t.formatRange = function (m1, m2, formatStr) {
    // a function that returns a formatStr // TODO: in future, precompute this
    if (typeof formatStr === 'function') {
      formatStr = formatStr.call(t, options, localeData);
    }

    return formatRange(m1, m2, formatStr, null, options.isRTL);
  };

  // Like the vanilla formatDate, but with calendar-specific settings applied.
  t.formatDate = function (mom, formatStr) {
    // a function that returns a formatStr // TODO: in future, precompute this
    if (typeof formatStr === 'function') {
      formatStr = formatStr.call(t, options, localeData);
    }

    return formatDate(mom, formatStr);
  };

  // Imports
  // -----------------------------------------------------------------------------------

  EventManager.call(t, options);
  var isFetchNeeded = t.isFetchNeeded;
  var fetchEvents = t.fetchEvents;

  // Locals
  // -----------------------------------------------------------------------------------

  var _element = element[0];
  var header;
  var headerElement;
  var content;
  var tm; // for making theme classes
  var currentView;
  var suggestedViewHeight;
  var windowResizeProxy; // wraps the windowResize function
  var ignoreWindowResize = 0;
  var date;
  var events = [];

  // Main Rendering
  // -----------------------------------------------------------------------------------

  if (options.defaultDate != null) {
    date = t.moment(options.defaultDate);
  } else {
    date = t.getNow();
  }

  function render(inc) {
    if (!content) {
      initialRender();
    } else if (elementVisible()) {
      // mainly for the public API
      calcSize();
      renderView(inc);
    }
  }

  function initialRender() {
    tm = options.theme ? 'ui' : 'fc';
    element.addClass('fcOld');

    if (options.isRTL) {
      element.addClass('fc-rtl');
    } else {
      element.addClass('fc-ltr');
    }

    if (options.theme) {
      element.addClass('ui-widget');
    } else {
      element.addClass('fc-unthemed');
    }

    var $viewBox = $('<div class="fc-view-container-box"></div>');
    $viewBox.prependTo(element);
    content = $("<div class='fc-view-container'/>").prependTo($viewBox);

    header = new Header(t, options);
    headerElement = header.render();
    if (headerElement) {
      element.prepend(headerElement);
    }

    changeView(options.defaultView);

    if (options.handleWindowResize) {
      windowResizeProxy = debounce(windowResize, options.windowResizeDelay); // prevents rapid calls
      $(window).resize(windowResizeProxy);
    }
  }

  function destroy() {
    if (currentView) {
      currentView.destroy();
    }

    header.destroy();
    content.remove();
    element.removeClass('fcOld fc-ltr fc-rtl fc-unthemed ui-widget');

    $(window).unbind('resize', windowResizeProxy);
  }

  function elementVisible() {
    return element.is(':visible');
  }

  // View Rendering
  // -----------------------------------------------------------------------------------

  function changeView(viewName) {
    renderView(0, viewName);
  }

  // Renders a view because of a date change, view-type change, or for the first time
  function renderView(delta, viewName) {
    ignoreWindowResize++;

    // if viewName is changing, destroy the old view
    if (currentView && viewName && currentView.name !== viewName) {
      header.deactivateButton(currentView.name);
      freezeContentHeight(); // prevent a scroll jump when view element is removed
      if (currentView.start) {
        // rendered before?
        currentView.destroy();
      }
      currentView.el.remove();
      currentView = null;
    }

    // if viewName changed, or the view was never created, create a fresh view
    if (!currentView && viewName) {
      currentView = new fcViews[viewName](t);
      currentView.el = $("<div class='fc-view fc-" + viewName + "-view' />").appendTo(content);
      header.activateButton(viewName);
    }

    if (currentView) {
      // let the view determine what the delta means
      if (delta) {
        date = currentView.incrementDate(date, delta);
      }

      // render or rerender the view
      if (
        !currentView.start || // never rendered before
        delta || // explicit date window change
        !date.isWithin(currentView.intervalStart, currentView.intervalEnd) // implicit date window change
      ) {
        if (elementVisible()) {
          freezeContentHeight();
          if (currentView.start) {
            // rendered before?
            currentView.destroy();
          }
          currentView.render(date);
          unfreezeContentHeight();

          // need to do this after View::render, so dates are calculated
          updateTitle();
          updateTodayButton();

          if (defaults.firstLoading) {
            getAndRenderEvents();
            defaults.firstLoading = false;
          }
          //getAndRenderEvents();
        }
      }
    }

    unfreezeContentHeight(); // undo any lone freezeContentHeight calls
    ignoreWindowResize--;
  }

  // Resizing
  // -----------------------------------------------------------------------------------

  t.getSuggestedViewHeight = function () {
    if (suggestedViewHeight === undefined) {
      calcSize();
    }
    return suggestedViewHeight;
  };

  t.isHeightAuto = function () {
    return options.contentHeight === 'auto' || options.height === 'auto';
  };

  function updateSize(shouldRecalc) {
    if (elementVisible()) {
      if (shouldRecalc) {
        _calcSize();
      }

      ignoreWindowResize++;
      currentView.updateSize(true); // isResize=true. will poll getSuggestedViewHeight() and isHeightAuto()
      ignoreWindowResize--;

      return true; // signal success
    }
  }

  function calcSize() {
    if (elementVisible()) {
      _calcSize();
    }
  }

  function _calcSize() {
    // assumes elementVisible
    if (typeof options.contentHeight === 'number') {
      // exists and not 'auto'
      suggestedViewHeight = options.contentHeight;
    } else if (typeof options.height === 'number') {
      // exists and not 'auto'
      suggestedViewHeight = options.height - (headerElement ? headerElement.outerHeight(true) : 0);
    } else {
      suggestedViewHeight = Math.round(content.width() / Math.max(options.aspectRatio, 0.5));
    }
  }

  function windowResize(ev) {
    if (
      !ignoreWindowResize &&
      ev.target === window && // so we don't process jqui "resize" events that have bubbled up
      currentView.start // view has already been rendered
    ) {
      if (updateSize(true)) {
        currentView.trigger('windowResize', _element);
      }
    }
  }

  /* Event Fetching/Rendering
        -----------------------------------------------------------------------------*/
  // TODO: going forward, most of this stuff should be directly handled by the view

  function refetchEvents() {
    // can be called as an API method
    destroyEvents(); // so that events are cleared before user starts waiting for AJAX
    fetchAndRenderEvents();
  }

  function renderEvents() {
    // destroys old events if previously rendered
    if (elementVisible()) {
      freezeContentHeight();
      currentView.destroyEvents(); // no performance cost if never rendered
      currentView.renderEvents(events);
      unfreezeContentHeight();
    }
  }

  function destroyEvents() {
    freezeContentHeight();
    currentView.destroyEvents();
    unfreezeContentHeight();
  }

  function getAndRenderEvents() {
    if (!options.lazyFetching || isFetchNeeded(currentView.start, currentView.end)) {
      fetchAndRenderEvents();
    } else {
      renderEvents();
    }
  }

  function fetchAndRenderEvents() {
    fetchEvents(currentView.start, currentView.end);
    // ... will call reportEvents
    // ... which will call renderEvents
  }

  // called when event data arrives
  function reportEvents(_events) {
    events = _events;
    renderEvents();
  }

  // called when a single event's data has been changed
  function reportEventChange() {
    renderEvents();
  }

  /* Header Updating
        -----------------------------------------------------------------------------*/

  function updateTitle() {
    header.updateTitle(currentView.title);
  }

  function updateTodayButton() {
    var now = t.getNow();
    if (now.isWithin(currentView.intervalStart, currentView.intervalEnd)) {
      header.disableButton('today');
    } else {
      header.enableButton('today');
    }
  }

  /* Selection
        -----------------------------------------------------------------------------*/

  function select(start, end) {
    start = t.moment(start);
    if (end) {
      end = t.moment(end);
    } else if (start.hasTime()) {
      end = start.clone().add(t.defaultTimedEventDuration);
    } else {
      end = start.clone().add(t.defaultAllDayEventDuration);
    }

    currentView.select(start, end);
  }

  function unselect() {
    // safe to be called before renderView
    if (currentView) {
      currentView.unselect();
    }
  }

  /* Date
        -----------------------------------------------------------------------------*/

  function prev() {
    renderView(-1);
  }

  function next() {
    renderView(1);
  }

  function prevYear() {
    date.add(-1, 'years');
    renderView();
  }

  function nextYear() {
    date.add(1, 'years');
    renderView();
  }

  function today() {
    date = t.getNow();
    renderView();
  }

  function gotoDate(dateInput) {
    date = t.moment(dateInput);
    renderView();
  }

  function incrementDate(delta) {
    date.add(moment.duration(delta));
    renderView();
  }

  // Forces navigation to a view for the given date.
  // `viewName` can be a specific view name or a generic one like "week" or "day".
  function zoomTo(newDate, viewName) {
    var viewStr;
    var match;

    if (!viewName || fcViews[viewName] === undefined) {
      // a general view name, or "auto"
      viewName = viewName || 'day';
      viewStr = header.getViewsWithButtons().join(' '); // space-separated string of all the views in the header

      // try to match a general view name, like "week", against a specific one, like "agendaWeek"
      match = viewStr.match(new RegExp('\\w+' + capitaliseFirstLetter(viewName)));

      // fall back to the day view being used in the header
      if (!match) {
        match = viewStr.match(/\w+Day/);
      }

      viewName = match ? match[0] : 'agendaDay'; // fall back to agendaDay
    }

    date = newDate;
    changeView(viewName);
  }

  function getDate() {
    return date.clone();
  }

  /* Height "Freezing"
        -----------------------------------------------------------------------------*/

  function freezeContentHeight() {
    content.css({
      width: '100%',
      height: content.height(),
      overflow: 'hidden',
    });
  }

  function unfreezeContentHeight() {
    content.css({
      width: '',
      height: '',
      overflow: '',
    });
  }

  /* Misc
        -----------------------------------------------------------------------------*/

  function getCalendar() {
    return t;
  }

  function getView() {
    return currentView;
  }

  function option(name, value) {
    if (value === undefined) {
      return options[name];
    }
    if (name == 'height' || name == 'contentHeight' || name == 'aspectRatio') {
      options[name] = value;
      updateSize(true); // true = allow recalculation of height
    }
  }

  function trigger(name, thisObj) {
    if (options[name]) {
      return options[name].apply(thisObj || _element, Array.prototype.slice.call(arguments, 2));
    }
  }
}

/* Top toolbar area with buttons and title
    ----------------------------------------------------------------------------------------------------------------------*/
// TODO: rename all header-related things to "toolbar"

function Header(calendar, options) {
  var t = this;

  // exports
  t.render = render;
  t.destroy = destroy;
  t.updateTitle = updateTitle;
  t.activateButton = activateButton;
  t.deactivateButton = deactivateButton;
  t.disableButton = disableButton;
  t.enableButton = enableButton;
  t.getViewsWithButtons = getViewsWithButtons;

  // locals
  var el = $();
  var viewsWithButtons = [];
  var tm;

  function render() {
    var sections = options.header;

    tm = options.theme ? 'ui' : 'fc';

    if (sections) {
      el = $("<div class='fc-toolbar'/>")
        .append(renderSection('left'))
        .append(renderSection('right'))
        .append(renderSection('center'))
        .append('<div class="fc-clear"/>');

      return el;
    }
  }

  function destroy() {
    el.remove();
  }

  function renderSection(position) {
    var sectionEl = $('<div class="fc-' + position + '"/>');
    var buttonStr = options.header[position];

    if (buttonStr) {
      $.each(buttonStr.split(' '), function (i) {
        var groupChildren = $();
        var isOnlyButtons = true;
        var groupEl;

        $.each(this.split(','), function (j, buttonName) {
          var buttonClick;
          var themeIcon;
          var normalIcon;
          var defaultText;
          var customText;
          var innerHtml;
          var classes;
          var button;

          if (buttonName == 'title') {
            groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
            isOnlyButtons = false;
          } else {
            if (calendar[buttonName]) {
              // a calendar method
              buttonClick = function () {
                calendar[buttonName]();
              };
            } else if (fcViews[buttonName]) {
              // a view name
              buttonClick = function () {
                calendar.changeView(buttonName);
              };
              viewsWithButtons.push(buttonName);
            }
            if (buttonClick) {
              // smartProperty allows different text per view button (ex: "Agenda Week" vs "Basic Week")
              themeIcon = smartProperty(options.themeButtonIcons, buttonName);
              normalIcon = smartProperty(options.buttonIcons, buttonName);
              defaultText = smartProperty(options.defaultButtonText, buttonName);
              customText = smartProperty(options.buttonText, buttonName);

              if (customText) {
                innerHtml = htmlEscape(customText);
              } else if (themeIcon && options.theme) {
                innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
              } else if (normalIcon && !options.theme) {
                innerHtml = "<span class='fc-icon fc-icon-" + normalIcon + "'></span>";
              } else {
                innerHtml = htmlEscape(defaultText || buttonName);
              }

              classes = ['fc-' + buttonName + '-button', tm + '-button', tm + '-state-default'];

              button = $(
                // type="button" so that it doesn't submit a form
                '<button type="button" class="' + classes.join(' ') + '">' + innerHtml + '</button>',
              )
                .click(function () {
                  // don't process clicks for disabled buttons
                  if (!button.hasClass(tm + '-state-disabled')) {
                    defaults.firstLoading = true;
                    buttonClick();

                    // after the click action, if the button becomes the "active" tab, or disabled,
                    // it should never have a hover class, so remove it now.
                    if (button.hasClass(tm + '-state-active') || button.hasClass(tm + '-state-disabled')) {
                      button.removeClass(tm + '-state-hover');
                    }
                  }
                })
                .mousedown(function () {
                  // the *down* effect (mouse pressed in).
                  // only on buttons that are not the "active" tab, or disabled
                  button
                    .not('.' + tm + '-state-active')
                    .not('.' + tm + '-state-disabled')
                    .addClass(tm + '-state-down');
                })
                .mouseup(function () {
                  // undo the *down* effect
                  button.removeClass(tm + '-state-down');
                })
                .hover(
                  function () {
                    // the *hover* effect.
                    // only on buttons that are not the "active" tab, or disabled
                    button
                      .not('.' + tm + '-state-active')
                      .not('.' + tm + '-state-disabled')
                      .addClass(tm + '-state-hover');
                  },
                  function () {
                    // undo the *hover* effect
                    button.removeClass(tm + '-state-hover').removeClass(tm + '-state-down'); // if mouseleave happens before mouseup
                  },
                );

              groupChildren = groupChildren.add(button);
            }
          }
        });

        if (isOnlyButtons) {
          groupChildren
            .first()
            .addClass(tm + '-corner-left')
            .end()
            .last()
            .addClass(tm + '-corner-right')
            .end();
        }

        if (groupChildren.length > 1) {
          groupEl = $('<div/>');
          if (isOnlyButtons) {
            groupEl.addClass('fc-button-group');
          }
          groupEl.append(groupChildren);
          sectionEl.append(groupEl);
        } else {
          sectionEl.append(groupChildren); // 1 or 0 children
        }
      });
    }

    return sectionEl;
  }

  function updateTitle(text) {
    el.find('h2').text(text);
  }

  function activateButton(buttonName) {
    el.find('.fc-' + buttonName + '-button').addClass(tm + '-state-active');
  }

  function deactivateButton(buttonName) {
    el.find('.fc-' + buttonName + '-button').removeClass(tm + '-state-active');
  }

  function disableButton(buttonName) {
    el.find('.fc-' + buttonName + '-button')
      .attr('disabled', 'disabled')
      .addClass(tm + '-state-disabled');
  }

  function enableButton(buttonName) {
    el.find('.fc-' + buttonName + '-button')
      .removeAttr('disabled')
      .removeClass(tm + '-state-disabled');
  }

  function getViewsWithButtons() {
    return viewsWithButtons;
  }
}

fc.sourceNormalizers = [];
fc.sourceFetchers = [];

var ajaxDefaults = {
  dataType: 'json',
  cache: false,
};

var eventGUID = 1;

function EventManager(options) {
  // assumed to be a calendar
  var t = this;

  // exports
  t.isFetchNeeded = isFetchNeeded;
  t.fetchEvents = fetchEvents;
  t.addEventSource = addEventSource;
  t.removeEventSource = removeEventSource;
  t.updateEvent = updateEvent;
  t.renderEvent = renderEvent;
  t.removeEvents = removeEvents;
  t.clientEvents = clientEvents;
  t.mutateEvent = mutateEvent;

  // imports
  var trigger = t.trigger;
  var getView = t.getView;
  var reportEvents = t.reportEvents;
  var getEventEnd = t.getEventEnd;

  // locals
  var stickySource = { events: [] };
  var sources = [stickySource];
  var rangeStart, rangeEnd;
  var currentFetchID = 0;
  var pendingSourceCnt = 0;
  var loadingLevel = 0;
  var cache = [];

  $.each((options.events ? [options.events] : []).concat(options.eventSources || []), function (i, sourceInput) {
    var source = buildEventSource(sourceInput);
    if (source) {
      sources.push(source);
    }
  });

  /* Fetching
        -----------------------------------------------------------------------------*/

  function isFetchNeeded(start, end) {
    return (
      !rangeStart || // nothing has been fetched yet?
      // or, a part of the new range is outside of the old range? (after normalizing)
      start.clone().stripZone() < rangeStart.clone().stripZone() ||
      end.clone().stripZone() > rangeEnd.clone().stripZone()
    );
  }

  function fetchEvents(start, end) {
    rangeStart = start;
    rangeEnd = end;
    cache = [];
    var fetchID = ++currentFetchID;
    var len = sources.length;
    pendingSourceCnt = len;
    for (var i = 0; i < len; i++) {
      fetchEventSource(sources[i], fetchID);
    }
  }

  function fetchEventSource(source, fetchID) {
    _fetchEventSource(source, function (events) {
      var isArraySource = $.isArray(source.events);
      var i;
      var event;

      if (fetchID == currentFetchID) {
        if (events) {
          for (i = 0; i < events.length; i++) {
            event = events[i];

            // event array sources have already been convert to Event Objects
            if (!isArraySource) {
              event = buildEvent(event, source);
            }

            if (event) {
              cache.push(event);
            }
          }
        }

        pendingSourceCnt--;
        if (!pendingSourceCnt) {
          reportEvents(cache);
        }
      }
    });
  }

  function _fetchEventSource(source, callback) {
    var i;
    var fetchers = fc.sourceFetchers;
    var res;

    for (i = 0; i < fetchers.length; i++) {
      res = fetchers[i].call(
        t, // this, the Calendar object
        source,
        rangeStart.clone(),
        rangeEnd.clone(),
        options.timezone,
        callback,
      );

      if (res === true) {
        // the fetcher is in charge. made its own async request
        return;
      } else if (typeof res == 'object') {
        // the fetcher returned a new source. process it
        _fetchEventSource(res, callback);
        return;
      }
    }

    var events = source.events;
    if (events) {
      if ($.isFunction(events)) {
        pushLoading();
        events.call(
          t, // this, the Calendar object
          rangeStart.clone(),
          rangeEnd.clone(),
          options.timezone,
          function (events) {
            callback(events);
            popLoading();
          },
        );
      } else if ($.isArray(events)) {
        callback(events);
      } else {
        callback();
      }
    } else {
      var url = source.url;
      if (url) {
        var success = source.success;
        var error = source.error;
        var complete = source.complete;

        // retrieve any outbound GET/POST $.ajax data from the options
        var customData;
        if ($.isFunction(source.data)) {
          // supplied as a function that returns a key/value object
          customData = source.data();
        } else {
          // supplied as a straight key/value object
          customData = source.data;
        }

        // use a copy of the custom data so we can modify the parameters
        // and not affect the passed-in object.
        var data = $.extend({}, customData || {});

        var startParam = firstDefined(source.startParam, options.startParam);
        var endParam = firstDefined(source.endParam, options.endParam);
        var timezoneParam = firstDefined(source.timezoneParam, options.timezoneParam);

        if (startParam) {
          data[startParam] = moment(rangeStart.format()).format();
        }
        if (endParam) {
          data[endParam] = moment(rangeEnd.format()).format();
        }
        if (options.timezone && options.timezone != 'local') {
          data[timezoneParam] = options.timezone;
        }

        pushLoading();

        //新加载数据方法
        source
          .url(data)
          .then(function (events) {
            events = events.data.calendars || [];
            var res = applyAll(success, this, arguments);
            if ($.isArray(res)) {
              events = res;
            }
            events.forEach(item => {
              if (
                !item.allDay &&
                moment(item.startTime).format('YYYY-MM-DD') !== moment(item.endTime).format('YYYY-MM-DD')
              ) {
                item.allDay = true;
              }

              if (
                item.allDay &&
                !item.isAllDay &&
                moment(item.startTime).format('YYYY-MM-DD') === moment(item.endTime).format('YYYY-MM-DD')
              ) {
                item.allDay = false;
              }
            });
            callback(events);
            popLoading();
          })
          .fail(function () {
            applyAll(error, this, arguments);
            callback();
          });

        //插件原来加载数据方法
        // $.ajax($.extend({}, ajaxDefaults, source, {
        //     data: data,
        //     success: function (events) {
        //         events = events || [];
        //         var res = applyAll(success, this, arguments);
        //         if ($.isArray(res)) {
        //             events = res;
        //         }
        //         callback(events);
        //     },
        //     error: function () {
        //         applyAll(error, this, arguments);
        //         callback();
        //     },
        //     complete: function () {
        //         applyAll(complete, this, arguments);
        //         popLoading();
        //     }
        // }));
      } else {
        callback();
      }
    }
  }

  /* Sources
        -----------------------------------------------------------------------------*/

  function addEventSource(sourceInput) {
    var source = buildEventSource(sourceInput);
    if (source) {
      sources.push(source);
      pendingSourceCnt++;
      fetchEventSource(source, currentFetchID); // will eventually call reportEvents
    }
  }

  function buildEventSource(sourceInput) {
    // will return undefined if invalid source
    var normalizers = fc.sourceNormalizers;
    var source;
    var i;

    if ($.isFunction(sourceInput) || $.isArray(sourceInput)) {
      source = { events: sourceInput };
    } else if (typeof sourceInput === 'string') {
      source = { url: sourceInput };
    } else if (typeof sourceInput === 'object') {
      source = $.extend({}, sourceInput); // shallow copy
    }

    if (source) {
      // TODO: repeat code, same code for event classNames
      if (source.className) {
        if (typeof source.className === 'string') {
          source.className = source.className.split(/\s+/);
        }
        // otherwise, assumed to be an array
      } else {
        source.className = [];
      }

      // for array sources, we convert to standard Event Objects up front
      if ($.isArray(source.events)) {
        source.events = $.map(source.events, function (eventInput) {
          return buildEvent(eventInput, source);
        });
      }

      for (i = 0; i < normalizers.length; i++) {
        normalizers[i].call(t, source);
      }

      return source;
    }
  }

  function removeEventSource(source) {
    sources = $.grep(sources, function (src) {
      return !isSourcesEqual(src, source);
    });
    // remove all client events from that source
    cache = $.grep(cache, function (e) {
      return !isSourcesEqual(e.source, source);
    });
    reportEvents(cache);
  }

  function isSourcesEqual(source1, source2) {
    return source1 && source2 && getSourcePrimitive(source1) == getSourcePrimitive(source2);
  }

  function getSourcePrimitive(source) {
    return (typeof source == 'object' ? source.events || source.url : '') || source;
  }

  /* Manipulation
        -----------------------------------------------------------------------------*/

  function updateEvent(event) {
    event.start = t.moment(event.start);
    if (event.end) {
      event.end = t.moment(event.end);
    }

    mutateEvent(event);
    propagateMiscProperties(event);
    reportEvents(cache); // reports event modifications (so we can redraw)
  }

  var miscCopyableProps = [
    'title',
    'url',
    'allDay',
    'className',
    'editable',
    'color',
    'backgroundColor',
    'borderColor',
    'textColor',
  ];

  function propagateMiscProperties(event) {
    var i;
    var cachedEvent;
    var j;
    var prop;

    for (i = 0; i < cache.length; i++) {
      cachedEvent = cache[i];
      if (cachedEvent._id == event._id && cachedEvent !== event) {
        for (j = 0; j < miscCopyableProps.length; j++) {
          prop = miscCopyableProps[j];
          if (event[prop] !== undefined) {
            cachedEvent[prop] = event[prop];
          }
        }
      }
    }
  }

  function renderEvent(eventData, stick) {
    var event = buildEvent(eventData);
    if (event) {
      if (!event.source) {
        if (stick) {
          stickySource.events.push(event);
          event.source = stickySource;
        }
        cache.push(event);
      }
      reportEvents(cache);
    }
  }

  function removeEvents(filter) {
    var eventID;
    var i;

    if (filter == null) {
      // null or undefined. remove all events
      filter = function () {
        return true;
      }; // will always match
    } else if (!$.isFunction(filter)) {
      // an event ID
      eventID = filter + '';
      filter = function (event) {
        return event._id == eventID;
      };
    }

    // Purge event(s) from our local cache
    cache = $.grep(cache, filter, true); // inverse=true

    // Remove events from array sources.
    // This works because they have been converted to official Event Objects up front.
    // (and as a result, event._id has been calculated).
    for (i = 0; i < sources.length; i++) {
      if ($.isArray(sources[i].events)) {
        sources[i].events = $.grep(sources[i].events, filter, true);
      }
    }

    reportEvents(cache);
  }

  function clientEvents(filter) {
    if ($.isFunction(filter)) {
      return $.grep(cache, filter);
    } else if (filter != null) {
      // not null, not undefined. an event ID
      filter += '';
      return $.grep(cache, function (e) {
        return e._id == filter;
      });
    }
    return cache; // else, return all
  }

  /* Loading State
        -----------------------------------------------------------------------------*/

  function pushLoading() {
    if (!loadingLevel++) {
      trigger('loading', null, true, getView());
    }
  }

  function popLoading() {
    if (!--loadingLevel) {
      trigger('loading', null, false, getView());
    }
  }

  /* Event Normalization
        -----------------------------------------------------------------------------*/

  function buildEvent(data, source) {
    // source may be undefined!
    var out = {};
    var start;
    var end;
    var allDay;
    var allDayDefault;
    var isAddOneDay =
      moment(data.start).format('YYYY-MM-DD') !== moment(data.end).format('YYYY-MM-DD') &&
      data.start.substr(0, 10) === data.end.substr(0, 10);
    var isReduceOneDay =
      moment(data.start).format('YYYY-MM-DD') === moment(data.end).add('d', -1).format('YYYY-MM-DD') &&
      data.start.substr(0, 10) !== data.end.substr(0, 10);

    if (options.eventDataTransform) {
      data = options.eventDataTransform(data);
    }
    if (source && source.eventDataTransform) {
      data = source.eventDataTransform(data);
    }

    start = t.moment(data.start || data.date); // "date" is an alias for "start"
    if (!start.isValid()) {
      return;
    }

    end = null;
    if (data.end) {
      end = t.moment(data.end);
      if (!end.isValid()) {
        return;
      }
    }

    allDay = data.allDay;
    if (allDay === undefined) {
      allDayDefault = firstDefined(source ? source.allDayDefault : undefined, options.allDayDefault);
      if (allDayDefault !== undefined) {
        // use the default
        allDay = allDayDefault;
      } else {
        // all dates need to have ambig time for the event to be considered allDay
        allDay = !start.hasTime() && (!end || !end.hasTime());
      }
    }

    // normalize the date based on allDay
    if (allDay) {
      // neither date should have a time
      if (start.hasTime()) {
        start.stripTime();
      }
      if (end && end.hasTime()) {
        end.stripTime();
      }
      if (data.isTask || isAddOneDay) {
        end = end.add(1, 'd');
      }
    } else {
      // force a time/zone up the dates
      if (!start.hasTime()) {
        start = t.rezoneDate(start);
      }
      if (end && isReduceOneDay) {
        end = end.add('d', -1);
      }
      if (end && !end.hasTime()) {
        end = t.rezoneDate(end);
      }
    }

    // Copy all properties over to the resulting object.
    // The special-case properties will be copied over afterwards.
    $.extend(out, data);

    if (source) {
      out.source = source;
    }

    out._id = data._id || (data.id === undefined ? '_fc' + eventGUID++ : data.id + '');

    if (data.className) {
      if (typeof data.className == 'string') {
        out.className = data.className.split(/\s+/);
      } else {
        // assumed to be an array
        out.className = data.className;
      }
    } else {
      out.className = [];
    }

    out.allDay = allDay;
    out.start = start;
    out.end = end;

    if (options.forceEventDuration && !out.end) {
      out.end = getEventEnd(out);
    }

    backupEventDates(out);

    return out;
  }

  /* Event Modification Math
        -----------------------------------------------------------------------------------------*/

  // Modify the date(s) of an event and make this change propagate to all other events with
  // the same ID (related repeating events).
  //
  // If `newStart`/`newEnd` are not specified, the "new" dates are assumed to be `event.start` and `event.end`.
  // The "old" dates to be compare against are always `event._start` and `event._end` (set by EventManager).
  //
  // Returns an object with delta information and a function to undo all operations.
  //
  function mutateEvent(event, newStart, newEnd) {
    var oldAllDay = event._allDay;
    var oldStart = event._start;
    var oldEnd = event._end;
    var clearEnd = false;
    var newAllDay;
    var dateDelta;
    var durationDelta;
    var undoFunc;

    // if no new dates were passed in, compare against the event's existing dates
    if (!newStart && !newEnd) {
      newStart = event.start;
      newEnd = event.end;
    }

    // NOTE: throughout this function, the initial values of `newStart` and `newEnd` are
    // preserved. These values may be undefined.

    // detect new allDay
    if (event.allDay != oldAllDay) {
      // if value has changed, use it
      newAllDay = event.allDay;
    } else {
      // otherwise, see if any of the new dates are allDay
      newAllDay = !(newStart || newEnd).hasTime();
    }

    // normalize the new dates based on allDay
    if (newAllDay) {
      if (newStart) {
        newStart = newStart.clone().stripTime();
      }
      if (newEnd) {
        newEnd = newEnd.clone().stripTime();
      }
    }

    // compute dateDelta
    if (newStart) {
      if (newAllDay) {
        dateDelta = dayishDiff(newStart, oldStart.clone().stripTime()); // treat oldStart as allDay
      } else {
        dateDelta = dayishDiff(newStart, oldStart);
      }
    }

    if (newAllDay != oldAllDay) {
      // if allDay has changed, always throw away the end
      clearEnd = true;
    } else if (newEnd) {
      durationDelta = dayishDiff(
        // new duration
        newEnd || t.getDefaultEventEnd(newAllDay, newStart || oldStart),
        newStart || oldStart,
      ).subtract(
        dayishDiff(
          // subtract old duration
          oldEnd || t.getDefaultEventEnd(oldAllDay, oldStart),
          oldStart,
        ),
      );
    }

    //修改：04/27/2016 Cloud 当为特殊子日程时，不修改其他日程的位置
    undoFunc = mutateEvents(
      event.isChildCalendar ? [event] : clientEvents(event._id), // get events with this ID
      clearEnd,
      newAllDay,
      dateDelta,
      durationDelta,
    );

    return {
      dateDelta: dateDelta,
      durationDelta: durationDelta,
      undo: undoFunc,
    };
  }

  // Modifies an array of events in the following ways (operations are in order):
  // - clear the event's `end`
  // - convert the event to allDay
  // - add `dateDelta` to the start and end
  // - add `durationDelta` to the event's duration
  //
  // Returns a function that can be called to undo all the operations.
  //
  function mutateEvents(events, clearEnd, forceAllDay, dateDelta, durationDelta) {
    var isAmbigTimezone = t.getIsAmbigTimezone();
    var undoFunctions = [];

    $.each(events, function (i, event) {
      var oldAllDay = event._allDay;
      var oldStart = event._start;
      var oldEnd = event._end;
      var newAllDay = forceAllDay != null ? forceAllDay : oldAllDay;
      var newStart = oldStart.clone();
      var newEnd = !clearEnd && oldEnd ? oldEnd.clone() : null;

      // NOTE: this function is responsible for transforming `newStart` and `newEnd`,
      // which were initialized to the OLD values first. `newEnd` may be null.

      // normlize newStart/newEnd to be consistent with newAllDay
      if (newAllDay) {
        newStart.stripTime();
        if (newEnd) {
          newEnd.stripTime();
        }
      } else {
        if (!newStart.hasTime()) {
          newStart = t.rezoneDate(newStart);
        }
        if (newEnd && !newEnd.hasTime()) {
          newEnd = t.rezoneDate(newEnd);
        }
      }

      // ensure we have an end date if necessary
      if (!newEnd && (options.forceEventDuration || +durationDelta)) {
        newEnd = t.getDefaultEventEnd(newAllDay, newStart);
      }

      // translate the dates
      newStart.add(dateDelta);
      if (newEnd) {
        newEnd.add(dateDelta).add(durationDelta);
      }

      // if the dates have changed, and we know it is impossible to recompute the
      // timezone offsets, strip the zone.
      if (isAmbigTimezone) {
        if (+dateDelta || +durationDelta) {
          newStart.stripZone();
          if (newEnd) {
            newEnd.stripZone();
          }
        }
      }

      event.allDay = newAllDay;
      event.start = newStart;
      event.end = newEnd;
      backupEventDates(event);

      undoFunctions.push(function () {
        event.allDay = oldAllDay;
        event.start = oldStart;
        event.end = oldEnd;
        backupEventDates(event);
      });
    });

    return function () {
      for (var i = 0; i < undoFunctions.length; i++) {
        undoFunctions[i]();
      }
    };
  }
}

// updates the "backup" properties, which are preserved in order to compute diffs later on.
function backupEventDates(event) {
  event._allDay = event.allDay;
  event._start = event.start.clone();
  event._end = event.end ? event.end.clone() : null;
}

/* FullCalendar-specific DOM Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

// Given the scrollbar widths of some other container, create borders/margins on rowEls in order to match the left
// and right space that was offset by the scrollbars. A 1-pixel border first, then margin beyond that.
function compensateScroll(rowEls, scrollbarWidths) {
  if (scrollbarWidths.left) {
    rowEls.css({
      'border-left-width': 1,
      'margin-left': scrollbarWidths.left - 1,
    });
  }
  if (scrollbarWidths.right) {
    rowEls.css({
      'border-right-width': 1,
      'margin-right': scrollbarWidths.right - 1,
    });
  }
}

// Undoes compensateScroll and restores all borders/margins
function uncompensateScroll(rowEls) {
  rowEls.css({
    'margin-left': '',
    'margin-right': '',
    'border-left-width': '',
    'border-right-width': '',
  });
}

// Given a total available height to fill, have `els` (essentially child rows) expand to accomodate.
// By default, all elements that are shorter than the recommended height are expanded uniformly, not considering
// any other els that are already too tall. if `shouldRedistribute` is on, it considers these tall rows and
// reduces the available height.
function distributeHeight(els, availableHeight, shouldRedistribute) {
  // *FLOORING NOTE*: we floor in certain places because zoom can give inaccurate floating-point dimensions,
  // and it is better to be shorter than taller, to avoid creating unnecessary scrollbars.

  var minOffset1 = Math.floor(availableHeight / els.length); // for non-last element
  var minOffset2 = Math.floor(availableHeight - minOffset1 * (els.length - 1)); // for last element *FLOORING NOTE*
  var flexEls = []; // elements that are allowed to expand. array of DOM nodes
  var flexOffsets = []; // amount of vertical space it takes up
  var flexHeights = []; // actual css height
  var usedHeight = 0;

  undistributeHeight(els); // give all elements their natural height

  // find elements that are below the recommended height (expandable).
  // important to query for heights in a single first pass (to avoid reflow oscillation).
  els.each(function (i, el) {
    var minOffset = i === els.length - 1 ? minOffset2 : minOffset1;
    var naturalOffset = $(el).outerHeight(true);

    if (naturalOffset < minOffset) {
      flexEls.push(el);
      flexOffsets.push(naturalOffset);
      flexHeights.push($(el).height());
    } else {
      // this element stretches past recommended height (non-expandable). mark the space as occupied.
      usedHeight += naturalOffset;
    }
  });

  // readjust the recommended height to only consider the height available to non-maxed-out rows.
  if (shouldRedistribute) {
    availableHeight -= usedHeight;
    minOffset1 = Math.floor(availableHeight / flexEls.length);
    minOffset2 = Math.floor(availableHeight - minOffset1 * (flexEls.length - 1)); // *FLOORING NOTE*
  }

  // assign heights to all expandable elements
  $(flexEls).each(function (i, el) {
    var minOffset = i === flexEls.length - 1 ? minOffset2 : minOffset1;
    var naturalOffset = flexOffsets[i];
    var naturalHeight = flexHeights[i];
    var newHeight = minOffset - (naturalOffset - naturalHeight); // subtract the margin/padding

    if (naturalOffset < minOffset) {
      // we check this again because redistribution might have changed things
      $(el).height(newHeight);
    }
  });
}

// Undoes distrubuteHeight, restoring all els to their natural height
function undistributeHeight(els) {
  els.height('');
}

// Given `els`, a jQuery set of <td> cells, find the cell with the largest natural width and set the widths of all the
// cells to be that width.
// PREREQUISITE: if you want a cell to take up width, it needs to have a single inner element w/ display:inline
function matchCellWidths(els) {
  var maxInnerWidth = 0;

  els.find('> *').each(function (i, innerEl) {
    var innerWidth = $(innerEl).outerWidth();
    if (innerWidth > maxInnerWidth) {
      maxInnerWidth = innerWidth;
    }
  });

  maxInnerWidth++; // sometimes not accurate of width the text needs to stay on one line. insurance

  els.width(maxInnerWidth);

  return maxInnerWidth;
}

// Turns a container element into a scroller if its contents is taller than the allotted height.
// Returns true if the element is now a scroller, false otherwise.
// NOTE: this method is best because it takes weird zooming dimensions into account
function setPotentialScroller(containerEl, height) {
  containerEl.height(height).addClass('fc-scroller');

  // are scrollbars needed?
  if (containerEl[0].scrollHeight - 1 > containerEl[0].clientHeight) {
    // !!! -1 because IE is often off-by-one :(
    return true;
  }

  unsetScroller(containerEl); // undo
  return false;
}

// Takes an element that might have been a scroller, and turns it back into a normal element.
function unsetScroller(containerEl) {
  containerEl.height('').removeClass('fc-scroller');
}

/* General DOM Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

// borrowed from https://github.com/jquery/jquery-ui/blob/1.11.0/ui/core.js#L51
function getScrollParent(el) {
  var position = el.css('position'),
    scrollParent = el
      .parents()
      .filter(function () {
        var parent = $(this);
        return /(auto|scroll)/.test(parent.css('overflow') + parent.css('overflow-y') + parent.css('overflow-x'));
      })
      .eq(0);

  return position === 'fixed' || !scrollParent.length ? $(el[0].ownerDocument || document) : scrollParent;
}

// Given a container element, return an object with the pixel values of the left/right scrollbars.
// Left scrollbars might occur on RTL browsers (IE maybe?) but I have not tested.
// PREREQUISITE: container element must have a single child with display:block
function getScrollbarWidths(container) {
  var containerLeft = container.offset().left;
  var containerRight = containerLeft + container.width();
  var inner = container.children();
  var innerLeft = inner.offset().left;
  var innerRight = innerLeft + inner.outerWidth();

  return {
    left: innerLeft - containerLeft,
    right: containerRight - innerRight,
  };
}

// Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
function isPrimaryMouseButton(ev) {
  return ev.which == 1 && !ev.ctrlKey;
}

/* FullCalendar-specific Misc Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

// Creates a basic segment with the intersection of the two ranges. Returns undefined if no intersection.
// Expects all dates to be normalized to the same timezone beforehand.
function intersectionToSeg(subjectStart, subjectEnd, intervalStart, intervalEnd) {
  var segStart, segEnd;
  var isStart, isEnd;

  if (subjectEnd > intervalStart && subjectStart < intervalEnd) {
    // in bounds at all?

    if (subjectStart >= intervalStart) {
      segStart = subjectStart.clone();
      isStart = true;
    } else {
      segStart = intervalStart.clone();
      isStart = false;
    }

    if (subjectEnd <= intervalEnd) {
      segEnd = subjectEnd.clone();
      isEnd = true;
    } else {
      segEnd = intervalEnd.clone();
      isEnd = false;
    }

    return {
      start: segStart,
      end: segEnd,
      isStart: isStart,
      isEnd: isEnd,
    };
  }
}

function smartProperty(obj, name) {
  // get a camel-cased/namespaced property of an object
  obj = obj || {};
  if (obj[name] !== undefined) {
    return obj[name];
  }
  var parts = name.split(/(?=[A-Z])/),
    i = parts.length - 1,
    res;
  for (; i >= 0; i--) {
    res = obj[parts[i].toLowerCase()];
    if (res !== undefined) {
      return res;
    }
  }
  return obj['default'];
}

/* Date Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

var dayIDs = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];

// Diffs the two moments into a Duration where full-days are recorded first, then the remaining time.
// Moments will have their timezones normalized.
function dayishDiff(a, b) {
  return moment.duration({
    days: a.clone().stripTime().diff(b.clone().stripTime(), 'days'),
    ms: a.time() - b.time(),
  });
}

function isNativeDate(input) {
  return Object.prototype.toString.call(input) === '[object Date]' || input instanceof Date;
}

function dateCompare(a, b) {
  // works with Moments and native Dates
  return a - b;
}

/* General Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

fc.applyAll = applyAll; // export

// Create an object that has the given prototype. Just like Object.create
function createObject(proto) {
  var f = function () {};
  f.prototype = proto;
  return new f();
}

// Copies specifically-owned (non-protoype) properties of `b` onto `a`.
// FYI, $.extend would copy *all* properties of `b` onto `a`.
function extend(a, b) {
  for (var i in b) {
    if (b.hasOwnProperty(i)) {
      a[i] = b[i];
    }
  }
}

function applyAll(functions, thisObj, args) {
  if ($.isFunction(functions)) {
    functions = [functions];
  }
  if (functions) {
    var i;
    var ret;
    for (i = 0; i < functions.length; i++) {
      ret = functions[i].apply(thisObj, args) || ret;
    }
    return ret;
  }
}

function firstDefined() {
  for (var i = 0; i < arguments.length; i++) {
    if (arguments[i] !== undefined) {
      return arguments[i];
    }
  }
}

function htmlEscape(str) {
  var encodeHTMLRules = { '&': '&#38;', '<': '&lt;', '>': '&gt;', '"': '&#34;', "'": '&#39;', '/': '&#47;' };
  var matchHTML = /&(?!#?\w+;)|<|>|"|'|\//g;
  return str
    ? str.toString().replace(matchHTML, function (m) {
        return encodeHTMLRules[m] || m;
      })
    : '';
}

function stripHtmlEntities(text) {
  return text.replace(/&.*?;/g, '');
}

function capitaliseFirstLetter(str) {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds.
// https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
function debounce(func, wait) {
  var timeoutId;
  var args;
  var context;
  var timestamp; // of most recent call
  var later = function () {
    var last = +new Date() - timestamp;
    if (last < wait && last > 0) {
      timeoutId = setTimeout(later, wait - last);
    } else {
      timeoutId = null;
      func.apply(context, args);
      if (!timeoutId) {
        context = args = null;
      }
    }
  };

  return function () {
    context = this;
    args = arguments;
    timestamp = +new Date();
    if (!timeoutId) {
      timeoutId = setTimeout(later, wait);
    }
  };
}

var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;
var ambigTimeOrZoneRegex =
  /^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;

// Creating
// -------------------------------------------------------------------------------------------------

// Creates a new moment, similar to the vanilla moment(...) constructor, but with
// extra features (ambiguous time, enhanced formatting). When gived an existing moment,
// it will function as a clone (and retain the zone of the moment). Anything else will
// result in a moment in the local zone.
fc.moment = function () {
  return makeMoment(arguments);
};

// Sames as fc.moment, but forces the resulting moment to be in the UTC timezone.
fc.moment.utc = function () {
  var mom = makeMoment(arguments, true);

  // Force it into UTC because makeMoment doesn't guarantee it.
  if (mom.hasTime()) {
    // don't give ambiguously-timed moments a UTC zone
    mom.utc();
  }

  return mom;
};

// Same as fc.moment, but when given an ISO8601 string, the timezone offset is preserved.
// ISO8601 strings with no timezone offset will become ambiguously zoned.
fc.moment.parseZone = function () {
  return makeMoment(arguments, true, true);
};

// Builds an FCMoment from args. When given an existing moment, it clones. When given a native
// Date, or called with no arguments (the current time), the resulting moment will be local.
// Anything else needs to be "parsed" (a string or an array), and will be affected by:
//    parseAsUTC - if there is no zone information, should we parse the input in UTC?
//    parseZone - if there is zone information, should we force the zone of the moment?
function makeMoment(args, parseAsUTC, parseZone) {
  var input = args[0];
  var isSingleString = args.length == 1 && typeof input === 'string';
  var isAmbigTime;
  var isAmbigZone;
  var ambigMatch;
  var output; // an object with fields for the new FCMoment object

  if (moment.isMoment(input)) {
    output = moment.apply(null, args); // clone it

    // the ambig properties have not been preserved in the clone, so reassign them
    if (input._ambigTime) {
      output._ambigTime = true;
    }
    if (input._ambigZone) {
      output._ambigZone = true;
    }
  } else if (isNativeDate(input) || input === undefined) {
    output = moment.apply(null, args); // will be local
  } else {
    // "parsing" is required
    isAmbigTime = false;
    isAmbigZone = false;

    if (isSingleString) {
      if (ambigDateOfMonthRegex.test(input)) {
        // accept strings like '2014-05', but convert to the first of the month
        input += '-01';
        args = [input]; // for when we pass it on to moment's constructor
        isAmbigTime = true;
        isAmbigZone = true;
      } else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {
        isAmbigTime = !ambigMatch[5]; // no time part?
        isAmbigZone = true;
      }
    } else if ($.isArray(input)) {
      // arrays have no timezone information, so assume ambiguous zone
      isAmbigZone = true;
    }
    // otherwise, probably a string with a format

    if (parseAsUTC) {
      output = moment.utc.apply(moment, args);
    } else {
      output = moment.apply(null, args);
    }

    if (isAmbigTime) {
      output._ambigTime = true;
      output._ambigZone = true; // ambiguous time always means ambiguous zone
    } else if (parseZone) {
      // let's record the inputted zone somehow
      if (isAmbigZone) {
        output._ambigZone = true;
      } else if (isSingleString) {
        output.zone(input); // if not a valid zone, will assign UTC
      }
    }
  }

  return new FCMoment(output);
}

// Our subclass of Moment.
// Accepts an object with the internal Moment properties that should be copied over to
// `this` object (most likely another Moment object). The values in this data must not
// be referenced by anything else (two moments sharing a Date object for example).
function FCMoment(internalData) {
  extend(this, internalData);
}

// Chain the prototype to Moment's
FCMoment.prototype = createObject(moment.fn);

// We need this because Moment's implementation won't create an FCMoment,
// nor will it copy over the ambig flags.
FCMoment.prototype.clone = function () {
  return makeMoment([this]);
};

// Time-of-day
// -------------------------------------------------------------------------------------------------

// GETTER
// Returns a Duration with the hours/minutes/seconds/ms values of the moment.
// If the moment has an ambiguous time, a duration of 00:00 will be returned.
//
// SETTER
// You can supply a Duration, a Moment, or a Duration-like argument.
// When setting the time, and the moment has an ambiguous time, it then becomes unambiguous.
FCMoment.prototype.time = function (time) {
  if (time == null) {
    // getter
    return moment.duration({
      hours: this.hours(),
      minutes: this.minutes(),
      seconds: this.seconds(),
      milliseconds: this.milliseconds(),
    });
  } else {
    // setter

    delete this._ambigTime; // mark that the moment now has a time

    if (!moment.isDuration(time) && !moment.isMoment(time)) {
      time = moment.duration(time);
    }

    // The day value should cause overflow (so 24 hours becomes 00:00:00 of next day).
    // Only for Duration times, not Moment times.
    var dayHours = 0;
    if (moment.isDuration(time)) {
      dayHours = Math.floor(time.asDays()) * 24;
    }

    // We need to set the individual fields.
    // Can't use startOf('day') then add duration. In case of DST at start of day.
    return this.hours(dayHours + time.hours())
      .minutes(time.minutes())
      .seconds(time.seconds())
      .milliseconds(time.milliseconds());
  }
};

// Converts the moment to UTC, stripping out its time-of-day and timezone offset,
// but preserving its YMD. A moment with a stripped time will display no time
// nor timezone offset when .format() is called.
FCMoment.prototype.stripTime = function () {
  var a = this.toArray(); // year,month,date,hours,minutes,seconds as an array

  // set the internal UTC flag
  moment.fn.utc.call(this); // call the original method, because we don't want to affect _ambigZone

  this.year(a[0]) // TODO: find a way to do this in one shot
    .month(a[1])
    .date(a[2])
    .hours(0)
    .minutes(0)
    .seconds(0)
    .milliseconds(0);

  // Mark the time as ambiguous. This needs to happen after the .utc() call, which calls .zone(), which
  // clears all ambig flags. Same concept with the .year/month/date calls in the case of moment-timezone.
  this._ambigTime = true;
  this._ambigZone = true; // if ambiguous time, also ambiguous timezone offset

  return this; // for chaining
};

// Returns if the moment has a non-ambiguous time (boolean)
FCMoment.prototype.hasTime = function () {
  return !this._ambigTime;
};

// Timezone
// -------------------------------------------------------------------------------------------------

// Converts the moment to UTC, stripping out its timezone offset, but preserving its
// YMD and time-of-day. A moment with a stripped timezone offset will display no
// timezone offset when .format() is called.
FCMoment.prototype.stripZone = function () {
  var a = this.toArray(); // year,month,date,hours,minutes,seconds as an array
  var wasAmbigTime = this._ambigTime;

  moment.fn.utc.call(this); // set the internal UTC flag

  this.year(a[0]) // TODO: find a way to do this in one shot
    .month(a[1])
    .date(a[2])
    .hours(a[3])
    .minutes(a[4])
    .seconds(a[5])
    .milliseconds(a[6]);

  if (wasAmbigTime) {
    // the above call to .utc()/.zone() unfortunately clears the ambig flags, so reassign
    this._ambigTime = true;
  }

  // Mark the zone as ambiguous. This needs to happen after the .utc() call, which calls .zone(), which
  // clears all ambig flags. Same concept with the .year/month/date calls in the case of moment-timezone.
  this._ambigZone = true;

  return this; // for chaining
};

// Returns of the moment has a non-ambiguous timezone offset (boolean)
FCMoment.prototype.hasZone = function () {
  return !this._ambigZone;
};

// this method implicitly marks a zone
FCMoment.prototype.zone = function (tzo) {
  if (tzo != null) {
    // FYI, the delete statements need to be before the .zone() call or else chaos ensues
    // for reasons I don't understand.
    delete this._ambigTime;
    delete this._ambigZone;
  }

  return moment.fn.zone.apply(this, arguments);
};

// this method implicitly marks a zone
FCMoment.prototype.local = function () {
  var a = this.toArray(); // year,month,date,hours,minutes,seconds as an array
  var wasAmbigZone = this._ambigZone;

  // will happen anyway via .local()/.zone(), but don't want to rely on internal implementation
  delete this._ambigTime;
  delete this._ambigZone;

  moment.fn.local.apply(this, arguments);

  if (wasAmbigZone) {
    // If the moment was ambiguously zoned, the date fields were stored as UTC.
    // We want to preserve these, but in local time.
    this.year(a[0]) // TODO: find a way to do this in one shot
      .month(a[1])
      .date(a[2])
      .hours(a[3])
      .minutes(a[4])
      .seconds(a[5])
      .milliseconds(a[6]);
  }

  return this; // for chaining
};

// this method implicitly marks a zone
FCMoment.prototype.utc = function () {
  // will happen anyway via .local()/.zone(), but don't want to rely on internal implementation
  delete this._ambigTime;
  delete this._ambigZone;

  return moment.fn.utc.apply(this, arguments);
};

// Formatting
// -------------------------------------------------------------------------------------------------

FCMoment.prototype.format = function () {
  if (arguments[0]) {
    return formatDate(this, arguments[0]); // our extended formatting
  }
  if (this._ambigTime) {
    return momentFormat(this, 'YYYY-MM-DD');
  }
  if (this._ambigZone) {
    return momentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
  }
  return momentFormat(this); // default moment original formatting
};

FCMoment.prototype.toISOString = function () {
  if (this._ambigTime) {
    return momentFormat(this, 'YYYY-MM-DD');
  }
  if (this._ambigZone) {
    return momentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
  }
  return moment.fn.toISOString.apply(this, arguments);
};

// Querying
// -------------------------------------------------------------------------------------------------

// Is the moment within the specified range? `end` is exclusive.
FCMoment.prototype.isWithin = function (start, end) {
  var a = commonlyAmbiguate([this, start, end]);
  return a[0] >= a[1] && a[0] < a[2];
};

// When isSame is called with units, timezone ambiguity is normalized before the comparison happens.
// If no units are specified, the two moments must be identically the same, with matching ambig flags.
FCMoment.prototype.isSame = function (input, units) {
  var a;

  if (units) {
    a = commonlyAmbiguate([this, input], true); // normalize timezones but don't erase times
    return moment.fn.isSame.call(a[0], a[1], units);
  } else {
    input = fc.moment.parseZone(input); // normalize input
    return (
      moment.fn.isSame.call(this, input) &&
      Boolean(this._ambigTime) === Boolean(input._ambigTime) &&
      Boolean(this._ambigZone) === Boolean(input._ambigZone)
    );
  }
};

// Make these query methods work with ambiguous moments
$.each(['isBefore', 'isAfter'], function (i, methodName) {
  FCMoment.prototype[methodName] = function (input, units) {
    var a = commonlyAmbiguate([this, input]);
    return moment.fn[methodName].call(a[0], a[1], units);
  };
});

// Misc Internals
// -------------------------------------------------------------------------------------------------

// given an array of moment-like inputs, return a parallel array w/ moments similarly ambiguated.
// for example, of one moment has ambig time, but not others, all moments will have their time stripped.
// set `preserveTime` to `true` to keep times, but only normalize zone ambiguity.
function commonlyAmbiguate(inputs, preserveTime) {
  var outputs = [];
  var anyAmbigTime = false;
  var anyAmbigZone = false;
  var i;

  for (i = 0; i < inputs.length; i++) {
    outputs.push(fc.moment.parseZone(inputs[i]));
    anyAmbigTime = anyAmbigTime || outputs[i]._ambigTime;
    anyAmbigZone = anyAmbigZone || outputs[i]._ambigZone;
  }

  for (i = 0; i < outputs.length; i++) {
    if (anyAmbigTime && !preserveTime) {
      outputs[i].stripTime();
    } else if (anyAmbigZone) {
      outputs[i].stripZone();
    }
  }

  return outputs;
}

// Single Date Formatting
// -------------------------------------------------------------------------------------------------

// call this if you want Moment's original format method to be used
function momentFormat(mom, formatStr) {
  return moment.fn.format.call(mom, formatStr);
}

// Formats `date` with a Moment formatting string, but allow our non-zero areas and
// additional token.
function formatDate(date, formatStr) {
  return formatDateWithChunks(date, getFormatStringChunks(formatStr));
}

function formatDateWithChunks(date, chunks) {
  var s = '';
  var i;

  for (i = 0; i < chunks.length; i++) {
    s += formatDateWithChunk(date, chunks[i]);
  }

  return s;
}

// addition formatting tokens we want recognized
var tokenOverrides = {
  t: function (date) {
    // "a" or "p"
    return momentFormat(date, 'a').charAt(0);
  },
  T: function (date) {
    // "A" or "P"
    return momentFormat(date, 'A').charAt(0);
  },
};

function formatDateWithChunk(date, chunk) {
  var token;
  var maybeStr;

  if (typeof chunk === 'string') {
    // a literal string
    return chunk;
  } else if ((token = chunk.token)) {
    // a token, like "YYYY"
    if (tokenOverrides[token]) {
      return tokenOverrides[token](date); // use our custom token
    }
    return momentFormat(date, token);
  } else if (chunk.maybe) {
    // a grouping of other chunks that must be non-zero
    maybeStr = formatDateWithChunks(date, chunk.maybe);
    if (maybeStr.match(/[1-9]/)) {
      return maybeStr;
    }
  }

  return '';
}

// Date Range Formatting
// -------------------------------------------------------------------------------------------------
// TODO: make it work with timezone offset

// Using a formatting string meant for a single date, generate a range string, like
// "Sep 2 - 9 2013", that intelligently inserts a separator where the dates differ.
// If the dates are the same as far as the format string is concerned, just return a single
// rendering of one date, without any separator.
function formatRange(date1, date2, formatStr, separator, isRTL) {
  var localeData;

  date1 = fc.moment.parseZone(date1);
  date2 = fc.moment.parseZone(date2);

  localeData = (date1.localeData || date1.lang).call(date1); // works with moment-pre-2.8

  // Expand localized format strings, like "LL" -> "MMMM D YYYY"
  formatStr = localeData.longDateFormat(formatStr) || formatStr;
  // BTW, this is not important for `formatDate` because it is impossible to put custom tokens
  // or non-zero areas in Moment's localized format strings.

  separator = separator || ' - ';

  return formatRangeWithChunks(date1, date2, getFormatStringChunks(formatStr), separator, isRTL);
}
fc.formatRange = formatRange; // expose

function formatRangeWithChunks(date1, date2, chunks, separator, isRTL) {
  var chunkStr; // the rendering of the chunk
  var leftI;
  var leftStr = '';
  var rightI;
  var rightStr = '';
  var middleI;
  var middleStr1 = '';
  var middleStr2 = '';
  var middleStr = '';

  // Start at the leftmost side of the formatting string and continue until you hit a token
  // that is not the same between dates.
  for (leftI = 0; leftI < chunks.length; leftI++) {
    chunkStr = formatSimilarChunk(date1, date2, chunks[leftI]);
    if (chunkStr === false) {
      break;
    }
    leftStr += chunkStr;
  }

  // Similarly, start at the rightmost side of the formatting string and move left
  for (rightI = chunks.length - 1; rightI > leftI; rightI--) {
    chunkStr = formatSimilarChunk(date1, date2, chunks[rightI]);
    if (chunkStr === false) {
      break;
    }
    rightStr = chunkStr + rightStr;
  }

  // The area in the middle is different for both of the dates.
  // Collect them distinctly so we can jam them together later.
  for (middleI = leftI; middleI <= rightI; middleI++) {
    middleStr1 += formatDateWithChunk(date1, chunks[middleI]);
    middleStr2 += formatDateWithChunk(date2, chunks[middleI]);
  }

  if (middleStr1 || middleStr2) {
    if (isRTL) {
      middleStr = middleStr2 + separator + middleStr1;
    } else {
      middleStr = middleStr1 + separator + middleStr2;
    }
  }

  return leftStr + middleStr + rightStr;
}

var similarUnitMap = {
  Y: 'year',
  M: 'month',
  D: 'day', // day of month
  d: 'day', // day of week
  // prevents a separator between anything time-related...
  A: 'second', // AM/PM
  a: 'second', // am/pm
  T: 'second', // A/P
  t: 'second', // a/p
  H: 'second', // hour (24)
  h: 'second', // hour (12)
  m: 'second', // minute
  s: 'second', // second
};
// TODO: week maybe?

// Given a formatting chunk, and given that both dates are similar in the regard the
// formatting chunk is concerned, format date1 against `chunk`. Otherwise, return `false`.
function formatSimilarChunk(date1, date2, chunk) {
  var token;
  var unit;

  if (typeof chunk === 'string') {
    // a literal string
    return chunk;
  } else if ((token = chunk.token)) {
    unit = similarUnitMap[token.charAt(0)];
    // are the dates the same for this unit of measurement?
    if (unit && date1.isSame(date2, unit)) {
      return momentFormat(date1, token); // would be the same if we used `date2`
      // BTW, don't support custom tokens
    }
  }

  return false; // the chunk is NOT the same for the two dates
  // BTW, don't support splitting on non-zero areas
}

// Chunking Utils
// -------------------------------------------------------------------------------------------------

var formatStringChunkCache = {};

function getFormatStringChunks(formatStr) {
  if (formatStr in formatStringChunkCache) {
    return formatStringChunkCache[formatStr];
  }
  return (formatStringChunkCache[formatStr] = chunkFormatString(formatStr));
}

// Break the formatting string into an array of chunks
function chunkFormatString(formatStr) {
  var chunks = [];
  var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LT|(\w)\4*o?)|([^\w\[\(]+)/g; // TODO: more descrimination
  var match;

  while ((match = chunker.exec(formatStr))) {
    if (match[1]) {
      // a literal string inside [ ... ]
      chunks.push(match[1]);
    } else if (match[2]) {
      // non-zero formatting inside ( ... )
      chunks.push({ maybe: chunkFormatString(match[2]) });
    } else if (match[3]) {
      // a formatting token
      chunks.push({ token: match[3] });
    } else if (match[5]) {
      // an unenclosed literal string
      chunks.push(match[5]);
    }
  }

  return chunks;
}

/* A rectangular panel that is absolutely positioned over other content
    ------------------------------------------------------------------------------------------------------------------------
    Options:
    - className (string)
    - content (HTML string or jQuery element set)
    - parentEl
    - top
    - left
    - right (the x coord of where the right edge should be. not a "CSS" right)
    - autoHide (boolean)
    - show (callback)
    - hide (callback)
    */

function Popover(options) {
  this.options = options || {};
}

Popover.prototype = {
  isHidden: true,
  options: null,
  el: null, // the container element for the popover. generated by this object
  documentMousedownProxy: null, // document mousedown handler bound to `this`
  margin: 10, // the space required between the popover and the edges of the scroll container

  // Shows the popover on the specified position. Renders it if not already
  show: function () {
    if (this.isHidden) {
      if (!this.el) {
        this.render();
      }
      this.el.show();
      this.position();
      this.isHidden = false;
      this.trigger('show');
    }
  },

  // Hides the popover, through CSS, but does not remove it from the DOM
  hide: function () {
    if (!this.isHidden) {
      this.el.hide();
      this.isHidden = true;
      this.trigger('hide');
    }
  },

  // Creates `this.el` and renders content inside of it
  render: function () {
    var _this = this;
    var options = this.options;

    this.el = $('<div class="fc-popover"/>')
      .addClass(options.className || '')
      .css({
        // position initially to the top left to avoid creating scrollbars
        top: 0,
        left: 0,
      })
      .append(options.content)
      .appendTo(options.parentEl);

    // when a click happens on anything inside with a 'fc-close' className, hide the popover
    this.el.on('click', '.fc-close', function () {
      _this.hide();
    });

    if (options.autoHide) {
      $(document).on('mousedown', (this.documentMousedownProxy = $.proxy(this, 'documentMousedown')));
    }
  },

  // Triggered when the user clicks *anywhere* in the document, for the autoHide feature
  documentMousedown: function (ev) {
    // only hide the popover if the click happened outside the popover
    if (this.el && !$(ev.target).closest(this.el).length) {
      this.hide();
    }
  },

  // Hides and unregisters any handlers
  destroy: function () {
    this.hide();

    if (this.el) {
      this.el.remove();
      this.el = null;
    }

    $(document).off('mousedown', this.documentMousedownProxy);
  },

  // Positions the popover optimally, using the top/left/right options
  position: function () {
    var options = this.options;
    var origin = this.el.offsetParent().offset();
    var width = this.el.outerWidth();
    var height = this.el.outerHeight();
    var windowEl = $(window);
    var viewportEl = getScrollParent(this.el);
    var viewportTop;
    var viewportLeft;
    var viewportOffset;
    var top; // the "position" (not "offset") values for the popover
    var left; //

    // compute top and left
    top = options.top || 0;
    if (options.left !== undefined) {
      left = options.left;
    } else if (options.right !== undefined) {
      left = options.right - width; // derive the left value from the right value
    } else {
      left = 0;
    }

    if (viewportEl.is(window) || viewportEl.is(document)) {
      // normalize getScrollParent's result
      viewportEl = windowEl;
      viewportTop = 0; // the window is always at the top left
      viewportLeft = 0; // (and .offset() won't work if called here)
    } else {
      viewportOffset = viewportEl.offset();
      viewportTop = viewportOffset.top;
      viewportLeft = viewportOffset.left;
    }

    // if the window is scrolled, it causes the visible area to be further down
    viewportTop += windowEl.scrollTop();
    viewportLeft += windowEl.scrollLeft();

    // constrain to the view port. if constrained by two edges, give precedence to top/left
    if (options.viewportConstrain !== false) {
      top = Math.min(top, viewportTop + viewportEl.outerHeight() - height - this.margin);
      top = Math.max(top, viewportTop + this.margin);
      left = Math.min(left, viewportLeft + viewportEl.outerWidth() - width - this.margin);
      left = Math.max(left, viewportLeft + this.margin);
    }

    this.el.css({
      top: top - origin.top,
      left: left - origin.left,
    });
  },

  // Triggers a callback. Calls a function in the option hash of the same name.
  // Arguments beyond the first `name` are forwarded on.
  // TODO: better code reuse for this. Repeat code
  trigger: function (name) {
    if (this.options[name]) {
      this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
    }
  },
};

/* A "coordinate map" converts pixel coordinates into an associated cell, which has an associated date
    ------------------------------------------------------------------------------------------------------------------------
    Common interface:

    CoordMap.prototype = {
    build: function() {},
    getCell: function(x, y) {}
    };

    */

/* Coordinate map for a grid component
    ----------------------------------------------------------------------------------------------------------------------*/

function GridCoordMap(grid) {
  this.grid = grid;
}

GridCoordMap.prototype = {
  grid: null, // reference to the Grid
  rows: null, // the top-to-bottom y coordinates. including the bottom of the last item
  cols: null, // the left-to-right x coordinates. including the right of the last item

  containerEl: null, // container element that all coordinates are constrained to. optionally assigned
  minX: null,
  maxX: null, // exclusive
  minY: null,
  maxY: null, // exclusive

  // Queries the grid for the coordinates of all the cells
  build: function () {
    this.grid.buildCoords((this.rows = []), (this.cols = []));
    this.computeBounds();
  },

  // Given a coordinate of the document, gets the associated cell. If no cell is underneath, returns null
  getCell: function (x, y) {
    var cell = null;
    var rows = this.rows;
    var cols = this.cols;
    var r = -1;
    var c = -1;
    var i;

    if (this.inBounds(x, y)) {
      for (i = 0; i < rows.length; i++) {
        if (y >= rows[i][0] && y < rows[i][1]) {
          r = i;
          break;
        }
      }

      for (i = 0; i < cols.length; i++) {
        if (x >= cols[i][0] && x < cols[i][1]) {
          c = i;
          break;
        }
      }

      if (r >= 0 && c >= 0) {
        cell = { row: r, col: c };
        cell.grid = this.grid;
        cell.date = this.grid.getCellDate(cell);
      }
    }

    return cell;
  },

  // If there is a containerEl, compute the bounds into min/max values
  computeBounds: function () {
    var containerOffset;

    if (this.containerEl) {
      containerOffset = this.containerEl.offset();
      this.minX = containerOffset.left;
      this.maxX = containerOffset.left + this.containerEl.outerWidth();
      this.minY = containerOffset.top;
      this.maxY = containerOffset.top + this.containerEl.outerHeight();
    }
  },

  // Determines if the given coordinates are in bounds. If no `containerEl`, always true
  inBounds: function (x, y) {
    if (this.containerEl) {
      return x >= this.minX && x < this.maxX && y >= this.minY && y < this.maxY;
    }
    return true;
  },
};

/* Coordinate map that is a combination of multiple other coordinate maps
    ----------------------------------------------------------------------------------------------------------------------*/

function ComboCoordMap(coordMaps) {
  this.coordMaps = coordMaps;
}

ComboCoordMap.prototype = {
  coordMaps: null, // an array of CoordMaps

  // Builds all coordMaps
  build: function () {
    var coordMaps = this.coordMaps;
    var i;

    for (i = 0; i < coordMaps.length; i++) {
      coordMaps[i].build();
    }
  },

  // Queries all coordMaps for the cell underneath the given coordinates, returning the first result
  getCell: function (x, y) {
    var coordMaps = this.coordMaps;
    var cell = null;
    var i;

    for (i = 0; i < coordMaps.length && !cell; i++) {
      cell = coordMaps[i].getCell(x, y);
    }

    return cell;
  },
};

/* Tracks mouse movements over a CoordMap and raises events about which cell the mouse is over.
    ----------------------------------------------------------------------------------------------------------------------*/
// TODO: implement scrolling

function DragListener(coordMap, options) {
  this.coordMap = coordMap;
  this.options = options || {};
}

DragListener.prototype = {
  coordMap: null,
  options: null,

  isListening: false,
  isDragging: false,

  // the cell/date the mouse was over when listening started
  origCell: null,
  origDate: null,

  // the cell/date the mouse is over
  cell: null,
  date: null,

  // coordinates of the initial mousedown
  mouseX0: null,
  mouseY0: null,

  // handler attached to the document, bound to the DragListener's `this`
  mousemoveProxy: null,
  mouseupProxy: null,

  scrollEl: null,
  scrollBounds: null, // { top, bottom, left, right }
  scrollTopVel: null, // pixels per second
  scrollLeftVel: null, // pixels per second
  scrollIntervalId: null, // ID of setTimeout for scrolling animation loop
  scrollHandlerProxy: null, // this-scoped function for handling when scrollEl is scrolled

  scrollSensitivity: 30, // pixels from edge for scrolling to start
  scrollSpeed: 200, // pixels per second, at maximum speed
  scrollIntervalMs: 50, // millisecond wait between scroll increment

  // Call this when the user does a mousedown. Will probably lead to startListening
  mousedown: function (ev) {
    if (isPrimaryMouseButton(ev)) {
      ev.preventDefault(); // prevents native selection in most browsers

      this.startListening(ev);

      // start the drag immediately if there is no minimum distance for a drag start
      if (!this.options.distance) {
        this.startDrag(ev);
      }
    }
  },

  // Call this to start tracking mouse movements
  startListening: function (ev) {
    var scrollParent;
    var cell;

    if (!this.isListening) {
      // grab scroll container and attach handler
      if (ev && this.options.scroll) {
        scrollParent = getScrollParent($(ev.target));
        if (!scrollParent.is(window) && !scrollParent.is(document)) {
          this.scrollEl = scrollParent;

          // scope to `this`, and use `debounce` to make sure rapid calls don't happen
          this.scrollHandlerProxy = debounce($.proxy(this, 'scrollHandler'), 100);
          this.scrollEl.on('scroll', this.scrollHandlerProxy);
        }
      }

      this.computeCoords(); // relies on `scrollEl`

      // get info on the initial cell, date, and coordinates
      if (ev) {
        cell = this.getCell(ev);
        this.origCell = cell;
        this.origDate = cell ? cell.date : null;

        this.mouseX0 = ev.pageX;
        this.mouseY0 = ev.pageY;
      }

      $(document)
        .on('mousemove', (this.mousemoveProxy = $.proxy(this, 'mousemove')))
        .on('mouseup', (this.mouseupProxy = $.proxy(this, 'mouseup')))
        .on('selectstart', this.preventDefault); // prevents native selection in IE<=8

      this.isListening = true;
      this.trigger('listenStart', ev);
    }
  },

  // Recomputes the drag-critical positions of elements
  computeCoords: function () {
    this.coordMap.build();
    this.computeScrollBounds();
  },

  // Called when the user moves the mouse
  mousemove: function (ev) {
    var minDistance;
    var distanceSq; // current distance from mouseX0/mouseY0, squared

    if (!this.isDragging) {
      // if not already dragging...
      // then start the drag if the minimum distance criteria is met
      minDistance = this.options.distance || 1;
      distanceSq = Math.pow(ev.pageX - this.mouseX0, 2) + Math.pow(ev.pageY - this.mouseY0, 2);
      if (distanceSq >= minDistance * minDistance) {
        // use pythagorean theorem
        this.startDrag(ev);
      }
    }

    if (this.isDragging) {
      this.drag(ev); // report a drag, even if this mousemove initiated the drag
    }
  },

  // Call this to initiate a legitimate drag.
  // This function is called internally from this class, but can also be called explicitly from outside
  startDrag: function (ev) {
    var cell;

    if (!this.isListening) {
      // startDrag must have manually initiated
      this.startListening();
    }

    if (!this.isDragging) {
      this.isDragging = true;
      this.trigger('dragStart', ev);

      // report the initial cell the mouse is over
      cell = this.getCell(ev);
      if (cell) {
        this.cellOver(cell, true);
      }
    }
  },

  // Called while the mouse is being moved and when we know a legitimate drag is taking place
  drag: function (ev) {
    var cell;

    if (this.isDragging) {
      cell = this.getCell(ev);

      if (!isCellsEqual(cell, this.cell)) {
        // a different cell than before?
        if (this.cell) {
          this.cellOut();
        }
        if (cell) {
          this.cellOver(cell);
        }
      }

      this.dragScroll(ev); // will possibly cause scrolling
    }
  },

  // Called when a the mouse has just moved over a new cell
  cellOver: function (cell) {
    this.cell = cell;
    this.date = cell.date;
    this.trigger('cellOver', cell, cell.date);
  },

  // Called when the mouse has just moved out of a cell
  cellOut: function () {
    if (this.cell) {
      this.trigger('cellOut', this.cell);
      this.cell = null;
      this.date = null;
    }
  },

  // Called when the user does a mouseup
  mouseup: function (ev) {
    this.stopDrag(ev);
    this.stopListening(ev);
  },

  // Called when the drag is over. Will not cause listening to stop however.
  // A concluding 'cellOut' event will NOT be triggered.
  stopDrag: function (ev) {
    if (this.isDragging) {
      this.stopScrolling();
      this.trigger('dragStop', ev);
      this.isDragging = false;
    }
  },

  // Call this to stop listening to the user's mouse events
  stopListening: function (ev) {
    if (this.isListening) {
      // remove the scroll handler if there is a scrollEl
      if (this.scrollEl) {
        this.scrollEl.off('scroll', this.scrollHandlerProxy);
        this.scrollHandlerProxy = null;
      }

      $(document)
        .off('mousemove', this.mousemoveProxy)
        .off('mouseup', this.mouseupProxy)
        .off('selectstart', this.preventDefault);

      this.mousemoveProxy = null;
      this.mouseupProxy = null;

      this.isListening = false;
      this.trigger('listenStop', ev);

      this.origCell = this.cell = null;
      this.origDate = this.date = null;
    }
  },

  // Gets the cell underneath the coordinates for the given mouse event
  getCell: function (ev) {
    return this.coordMap.getCell(ev.pageX, ev.pageY);
  },

  // Triggers a callback. Calls a function in the option hash of the same name.
  // Arguments beyond the first `name` are forwarded on.
  trigger: function (name) {
    if (this.options[name]) {
      this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
    }
  },

  // Stops a given mouse event from doing it's native browser action. In our case, text selection.
  preventDefault: function (ev) {
    ev.preventDefault();
  },

  /* Scrolling
        ------------------------------------------------------------------------------------------------------------------*/

  // Computes and stores the bounding rectangle of scrollEl
  computeScrollBounds: function () {
    var el = this.scrollEl;
    var offset;

    if (el) {
      offset = el.offset();
      this.scrollBounds = {
        top: offset.top,
        left: offset.left,
        bottom: offset.top + el.outerHeight(),
        right: offset.left + el.outerWidth(),
      };
    }
  },

  // Called when the dragging is in progress and scrolling should be updated
  dragScroll: function (ev) {
    var sensitivity = this.scrollSensitivity;
    var bounds = this.scrollBounds;
    var topCloseness, bottomCloseness;
    var leftCloseness, rightCloseness;
    var topVel = 0;
    var leftVel = 0;

    if (bounds) {
      // only scroll if scrollEl exists

      // compute closeness to edges. valid range is from 0.0 - 1.0
      topCloseness = (sensitivity - (ev.pageY - bounds.top)) / sensitivity;
      bottomCloseness = (sensitivity - (bounds.bottom - ev.pageY)) / sensitivity;
      leftCloseness = (sensitivity - (ev.pageX - bounds.left)) / sensitivity;
      rightCloseness = (sensitivity - (bounds.right - ev.pageX)) / sensitivity;

      // translate vertical closeness into velocity.
      // mouse must be completely in bounds for velocity to happen.
      if (topCloseness >= 0 && topCloseness <= 1) {
        topVel = topCloseness * this.scrollSpeed * -1; // negative. for scrolling up
      } else if (bottomCloseness >= 0 && bottomCloseness <= 1) {
        topVel = bottomCloseness * this.scrollSpeed;
      }

      // translate horizontal closeness into velocity
      if (leftCloseness >= 0 && leftCloseness <= 1) {
        leftVel = leftCloseness * this.scrollSpeed * -1; // negative. for scrolling left
      } else if (rightCloseness >= 0 && rightCloseness <= 1) {
        leftVel = rightCloseness * this.scrollSpeed;
      }
    }

    this.setScrollVel(topVel, leftVel);
  },

  // Sets the speed-of-scrolling for the scrollEl
  setScrollVel: function (topVel, leftVel) {
    this.scrollTopVel = topVel;
    this.scrollLeftVel = leftVel;

    this.constrainScrollVel(); // massages into realistic values

    // if there is non-zero velocity, and an animation loop hasn't already started, then START
    if ((this.scrollTopVel || this.scrollLeftVel) && !this.scrollIntervalId) {
      this.scrollIntervalId = setInterval(
        $.proxy(this, 'scrollIntervalFunc'), // scope to `this`
        this.scrollIntervalMs,
      );
    }
  },

  // Forces scrollTopVel and scrollLeftVel to be zero if scrolling has already gone all the way
  constrainScrollVel: function () {
    var el = this.scrollEl;

    if (this.scrollTopVel < 0) {
      // scrolling up?
      if (el.scrollTop() <= 0) {
        // already scrolled all the way up?
        this.scrollTopVel = 0;
      }
    } else if (this.scrollTopVel > 0) {
      // scrolling down?
      if (el.scrollTop() + el[0].clientHeight >= el[0].scrollHeight) {
        // already scrolled all the way down?
        this.scrollTopVel = 0;
      }
    }

    if (this.scrollLeftVel < 0) {
      // scrolling left?
      if (el.scrollLeft() <= 0) {
        // already scrolled all the left?
        this.scrollLeftVel = 0;
      }
    } else if (this.scrollLeftVel > 0) {
      // scrolling right?
      if (el.scrollLeft() + el[0].clientWidth >= el[0].scrollWidth) {
        // already scrolled all the way right?
        this.scrollLeftVel = 0;
      }
    }
  },

  // This function gets called during every iteration of the scrolling animation loop
  scrollIntervalFunc: function () {
    var el = this.scrollEl;
    var frac = this.scrollIntervalMs / 1000; // considering animation frequency, what the vel should be mult'd by

    // change the value of scrollEl's scroll
    if (this.scrollTopVel) {
      el.scrollTop(el.scrollTop() + this.scrollTopVel * frac);
    }
    if (this.scrollLeftVel) {
      el.scrollLeft(el.scrollLeft() + this.scrollLeftVel * frac);
    }

    this.constrainScrollVel(); // since the scroll values changed, recompute the velocities

    // if scrolled all the way, which causes the vels to be zero, stop the animation loop
    if (!this.scrollTopVel && !this.scrollLeftVel) {
      this.stopScrolling();
    }
  },

  // Kills any existing scrolling animation loop
  stopScrolling: function () {
    if (this.scrollIntervalId) {
      clearInterval(this.scrollIntervalId);
      this.scrollIntervalId = null;

      // when all done with scrolling, recompute positions since they probably changed
      this.computeCoords();
    }
  },

  // Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
  scrollHandler: function () {
    // recompute all coordinates, but *only* if this is *not* part of our scrolling animation
    if (!this.scrollIntervalId) {
      this.computeCoords();
    }
  },
};

// Returns `true` if the cells are identically equal. `false` otherwise.
// They must have the same row, col, and be from the same grid.
// Two null values will be considered equal, as two "out of the grid" states are the same.
function isCellsEqual(cell1, cell2) {
  if (!cell1 && !cell2) {
    return true;
  }

  if (cell1 && cell2) {
    return cell1.grid === cell2.grid && cell1.row === cell2.row && cell1.col === cell2.col;
  }

  return false;
}

/* Creates a clone of an element and lets it track the mouse as it moves
    ----------------------------------------------------------------------------------------------------------------------*/

function MouseFollower(sourceEl, options) {
  this.options = options = options || {};
  this.sourceEl = sourceEl;
  this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent
}

MouseFollower.prototype = {
  options: null,

  sourceEl: null, // the element that will be cloned and made to look like it is dragging
  el: null, // the clone of `sourceEl` that will track the mouse
  parentEl: null, // the element that `el` (the clone) will be attached to

  // the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl
  top0: null,
  left0: null,

  // the initial position of the mouse
  mouseY0: null,
  mouseX0: null,

  // the number of pixels the mouse has moved from its initial position
  topDelta: null,
  leftDelta: null,

  mousemoveProxy: null, // document mousemove handler, bound to the MouseFollower's `this`

  isFollowing: false,
  isHidden: false,
  isAnimating: false, // doing the revert animation?

  // Causes the element to start following the mouse
  start: function (ev) {
    if (!this.isFollowing) {
      this.isFollowing = true;

      this.mouseY0 = ev.pageY;
      this.mouseX0 = ev.pageX;
      this.topDelta = 0;
      this.leftDelta = 0;

      if (!this.isHidden) {
        this.updatePosition();
      }

      $(document).on('mousemove', (this.mousemoveProxy = $.proxy(this, 'mousemove')));
    }
  },

  // Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.
  // `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.
  stop: function (shouldRevert, callback) {
    var _this = this;
    var revertDuration = this.options.revertDuration;

    function complete() {
      _this.isAnimating = false;
      _this.destroyEl();

      _this.top0 = _this.left0 = null; // reset state for future updatePosition calls

      if (callback) {
        callback();
      }
    }

    if (this.isFollowing && !this.isAnimating) {
      // disallow more than one stop animation at a time
      _this.isFollowing = false;

      $(document).off('mousemove', _this.mousemoveProxy);

      if (shouldRevert && revertDuration && !this.isHidden) {
        // do a revert animation?
        var calendarMonthTop =
            window.localStorage.getItem('lastView') === 'month' ? $('.fc-view.fc-month-view').scrollTop() : 0,
          calendarMonthLeft = 0;
        if (window.localStorage.getItem('lastView') === 'month' && $.browser.safari) {
          calendarMonthTop = 0;
          calendarMonthLeft = 250;
        }

        _this.isAnimating = true;
        _this.el.animate(
          {
            top: _this.top0 + calendarMonthTop,
            left: _this.left0 - calendarMonthLeft,
          },
          {
            duration: revertDuration,
            complete: complete,
          },
        );
      } else {
        complete();
      }
    }
  },

  // Gets the tracking element. Create it if necessary
  getEl: function () {
    var el = this.el;

    if (!el) {
      this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
      el = this.el = this.sourceEl
        .clone()
        .css({
          position: 'absolute',
          visibility: '', // in case original element was hidden (commonly through hideEvents())
          display: this.isHidden ? 'none' : '', // for when initially hidden
          margin: 0,
          right: 'auto', // erase and set width instead
          bottom: 'auto', // erase and set height instead
          width: this.sourceEl.width(), // explicit height in case there was a 'right' value
          height: this.sourceEl.height(), // explicit width in case there was a 'bottom' value
          opacity: this.options.opacity || '',
          zIndex: this.options.zIndex,
        })
        .appendTo(this.parentEl);
    }

    return el;
  },

  // Removes the tracking element if it has already been created
  destroyEl: function () {
    if (this.el) {
      this.el.remove();
      this.el = null;
    }
  },

  // Update the CSS position of the tracking element
  updatePosition: function () {
    var sourceOffset;
    var origin;

    this.getEl(); // ensure this.el

    // make sure origin info was computed
    if (this.top0 === null) {
      this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
      sourceOffset = this.sourceEl.offset();
      origin = this.el.offsetParent().offset();
      this.top0 = sourceOffset.top - origin.top;
      this.left0 = sourceOffset.left - origin.left;
    }

    this.el.css({
      top: this.top0 + this.topDelta,
      left: this.left0 + this.leftDelta,
    });
  },

  // Gets called when the user moves the mouse
  mousemove: function (ev) {
    var calendarMonthTop =
        window.localStorage.getItem('lastView') === 'month' ? $('.fc-view.fc-month-view').scrollTop() : 0,
      calendarMonthLeft = 0;
    if (window.localStorage.getItem('lastView') === 'month' && $.browser.safari) {
      calendarMonthTop = 0;
      calendarMonthLeft = 250;
    }

    this.topDelta = ev.pageY - this.mouseY0 + calendarMonthTop;
    this.leftDelta = ev.pageX - this.mouseX0 - calendarMonthLeft;

    if (!this.isHidden) {
      this.updatePosition();
    }
  },

  // Temporarily makes the tracking element invisible. Can be called before following starts
  hide: function () {
    if (!this.isHidden) {
      this.isHidden = true;
      if (this.el) {
        this.el.hide();
      }
    }
  },

  // Show the tracking element after it has been temporarily hidden
  show: function () {
    if (this.isHidden) {
      this.isHidden = false;
      this.updatePosition();
      this.getEl().show();
    }
  },
};

/* A utility class for rendering <tr> rows.
    ----------------------------------------------------------------------------------------------------------------------*/
// It leverages methods of the subclass and the View to determine custom rendering behavior for each row "type"
// (such as highlight rows, day rows, helper rows, etc).

function RowRenderer(view) {
  this.view = view;
}

RowRenderer.prototype = {
  view: null, // a View object
  cellHtml: '<td/>', // plain default HTML used for a cell when no other is available

  // Renders the HTML for a row, leveraging custom cell-HTML-renderers based on the `rowType`.
  // Also applies the "intro" and "outro" cells, which are specified by the subclass and views.
  // `row` is an optional row number.
  rowHtml: function (rowType, row) {
    var view = this.view;
    var renderCell = this.getHtmlRenderer('cell', rowType);
    var cellHtml = '';
    var col;
    var date;

    row = row || 0;

    for (col = 0; col < view.colCnt; col++) {
      date = view.cellToDate(row, col);
      cellHtml += renderCell(row, col, date);
    }

    cellHtml = this.bookendCells(cellHtml, rowType, row); // apply intro and outro

    return '<tr>' + cellHtml + '</tr>';
  },

  // Applies the "intro" and "outro" HTML to the given cells.
  // Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.
  // `cells` can be an HTML string of <td>'s or a jQuery <tr> element
  // `row` is an optional row number.
  bookendCells: function (cells, rowType, row) {
    var view = this.view;
    var intro = this.getHtmlRenderer('intro', rowType)(row || 0);
    var outro = this.getHtmlRenderer('outro', rowType)(row || 0);
    var isRTL = view.opt('isRTL');
    var prependHtml = isRTL ? outro : intro;
    var appendHtml = isRTL ? intro : outro;

    if (typeof cells === 'string') {
      return prependHtml + cells + appendHtml;
    } else {
      // a jQuery <tr> element
      return cells.prepend(prependHtml).append(appendHtml);
    }
  },

  // Returns an HTML-rendering function given a specific `rendererName` (like cell, intro, or outro) and a specific
  // `rowType` (like day, eventSkeleton, helperSkeleton), which is optional.
  // If a renderer for the specific rowType doesn't exist, it will fall back to a generic renderer.
  // We will query the View object first for any custom rendering functions, then the methods of the subclass.
  getHtmlRenderer: function (rendererName, rowType) {
    var view = this.view;
    var generalName; // like "cellHtml"
    var specificName; // like "dayCellHtml". based on rowType
    var provider; // either the View or the RowRenderer subclass, whichever provided the method
    var renderer;

    generalName = rendererName + 'Html';
    if (rowType) {
      specificName = rowType + capitaliseFirstLetter(rendererName) + 'Html';
    }

    if (specificName && (renderer = view[specificName])) {
      provider = view;
    } else if (specificName && (renderer = this[specificName])) {
      provider = this;
    } else if ((renderer = view[generalName])) {
      provider = view;
    } else if ((renderer = this[generalName])) {
      provider = this;
    }

    if (typeof renderer === 'function') {
      return function (row) {
        return renderer.apply(provider, arguments) || ''; // use correct `this` and always return a string
      };
    }

    // the rendered can be a plain string as well. if not specified, always an empty string.
    return function () {
      return renderer || '';
    };
  },
};

/* An abstract class comprised of a "grid" of cells that each represent a specific datetime
    ----------------------------------------------------------------------------------------------------------------------*/

function Grid(view) {
  RowRenderer.call(this, view); // call the super-constructor
  this.coordMap = new GridCoordMap(this);
}

Grid.prototype = createObject(RowRenderer.prototype); // declare the super-class
$.extend(Grid.prototype, {
  el: null, // the containing element
  coordMap: null, // a GridCoordMap that converts pixel values to datetimes
  cellDuration: null, // a cell's duration. subclasses must assign this ASAP

  // Renders the grid into the `el` element.
  // Subclasses should override and call this super-method when done.
  render: function () {
    this.bindHandlers();
  },

  // Called when the grid's resources need to be cleaned up
  destroy: function () {
    // subclasses can implement
  },

  /* Coordinates & Cells
        ------------------------------------------------------------------------------------------------------------------*/

  // Populates the given empty arrays with the y and x coordinates of the cells
  buildCoords: function (rows, cols) {
    // subclasses must implement
  },

  // Given a cell object, returns the date for that cell
  getCellDate: function (cell) {
    // subclasses must implement
  },

  // Given a cell object, returns the element that represents the cell's whole-day
  getCellDayEl: function (cell) {
    // subclasses must implement
  },

  // Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
  rangeToSegs: function (start, end) {
    // subclasses must implement
  },

  /* Handlers
        ------------------------------------------------------------------------------------------------------------------*/

  // Attach handlers to `this.el`, using bubbling to listen to all ancestors.
  // We don't need to undo any of this in a "destroy" method, because the view will simply remove `this.el` from the
  // DOM and jQuery will be smart enough to garbage collect the handlers.
  bindHandlers: function () {
    var _this = this;

    this.el.on('mousedown', function (ev) {
      if (
        !$(ev.target).is('.fc-more') && // not an an event element, or "more.." link .fc-event-container *
        !$(ev.target).closest('.fc-popover').length && // not on a popover (like the "more.." events one)
        $(ev.target).parents('.fc-draggable').length == 0 &&
        ($(ev.target).closest('.showActiveTitle').length == 0 || $(ev.target).closest('.fc-helper').length)
      ) {
        _this.dayMousedown(ev);
      }
    });

    if ($.browser.msie) {
      var ieVer = parseInt($.browser.version, 10);
      if (ieVer <= 8) {
        this.el.on('dblclick', function () {
          _this.dayMousedown(event, 1);
        });
      }
    }

    this.bindSegHandlers(); // attach event-element-related handlers. in Grid.events.js
  },

  // Process a mousedown on an element that represents a day. For day clicking and selecting.
  dayMousedown: function (ev, ieVer) {
    var _this = this;
    var view = this.view;
    var isSelectable = view.opt('selectable');
    var dates = null; // the inclusive dates of the selection. will be null if no selection
    var start; // the inclusive start of the selection
    var end; // the *exclusive* end of the selection
    var dayEl;

    // this listener tracks a mousedown on a day element, and a subsequent drag.
    // if the drag ends on the same day, it is a 'dayClick'.
    // if 'selectable' is enabled, this listener also detects selections.
    var dragListener = new DragListener(this.coordMap, {
      //distance: 5, // needs more work if we want dayClick to fire correctly
      scroll: view.opt('dragScroll'),
      dragStart: function () {
        view.unselect(); // since we could be rendering a new selection, we want to clear any old one
      },
      cellOver: function (cell, date) {
        if (dragListener.origDate) {
          // click needs to have started on a cell

          dayEl = _this.getCellDayEl(cell);

          dates = [date, dragListener.origDate].sort(dateCompare);
          start = dates[0];
          end = dates[1].clone().add(_this.cellDuration);

          if (isSelectable) {
            _this.renderSelection(start, end);
          }
        }
      },
      cellOut: function (cell, date) {
        dates = null;
        _this.destroySelection();
      },
      listenStop: function (ev) {
        if (dates) {
          // started and ended on a cell?
          if (dates[0].isSame(dates[1])) {
            view.trigger('dayClick', dayEl[0], start, ev);
          }
          if (isSelectable) {
            // the selection will already have been rendered. just report it
            view.reportSelection(start, end, ev);
          }
        }
      },
    });

    if (ieVer == 1) {
      //IE9ÒÔÏÂ·ÃÎÊ¼æÈÝ´¦Àí
      view.trigger('dayClick');
    }

    dragListener.mousedown(ev); // start listening, which will eventually initiate a dragStart
  },

  /* Event Dragging
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of a event being dragged over the given date(s).
  // `end` can be null, as well as `seg`. See View's documentation on renderDrag for more info.
  // A returned value of `true` signals that a mock "helper" event has been rendered.
  renderDrag: function (start, end, seg) {
    // subclasses must implement
  },

  // Unrenders a visual indication of an event being dragged
  destroyDrag: function () {
    // subclasses must implement
  },

  /* Event Resizing
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being resized.
  // `start` and `end` are the updated dates of the event. `seg` is the original segment object involved in the drag.
  renderResize: function (start, end, seg) {
    // subclasses must implement
  },

  // Unrenders a visual indication of an event being resized.
  destroyResize: function () {
    // subclasses must implement
  },

  /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a mock event over the given date(s).
  // `end` can be null, in which case the mock event that is rendered will have a null end time.
  // `sourceSeg` is the internal segment object involved in the drag. If null, something external is dragging.
  renderRangeHelper: function (start, end, sourceSeg) {
    var view = this.view;
    var fakeEvent;

    // compute the end time if forced to do so (this is what EventManager does)
    if (!end && view.opt('forceEventDuration')) {
      end = view.calendar.getDefaultEventEnd(!start.hasTime(), start);
    }

    fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible
    fakeEvent.start = start;
    fakeEvent.end = end;
    fakeEvent.allDay = !(start.hasTime() || (end && end.hasTime())); // freshly compute allDay

    // this extra className will be useful for differentiating real events from mock events in CSS
    fakeEvent.className = (fakeEvent.className || []).concat('fc-helper');

    // if something external is being dragged in, don't render a resizer
    if (!sourceSeg) {
      fakeEvent.editable = false;
    }

    this.renderHelper(fakeEvent, sourceSeg); // do the actual rendering
  },

  // Renders a mock event
  renderHelper: function (event, sourceSeg) {
    // subclasses must implement
  },

  // Unrenders a mock event
  destroyHelper: function () {
    // subclasses must implement
  },

  /* Selection
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of a selection. Will highlight by default but can be overridden by subclasses.
  renderSelection: function (start, end) {
    this.renderHighlight(start, end);
  },

  // Unrenders any visual indications of a selection. Will unrender a highlight by default.
  destroySelection: function () {
    this.destroyHighlight();
  },

  /* Highlight
        ------------------------------------------------------------------------------------------------------------------*/

  // Puts visual emphasis on a certain date range
  renderHighlight: function (start, end) {
    // subclasses should implement
  },

  // Removes visual emphasis on a date range
  destroyHighlight: function () {
    // subclasses should implement
  },

  /* Generic rendering utilities for subclasses
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a day-of-week header row
  headHtml: function () {
    return (
      '' +
      '<div class="fc-row ' +
      this.view.widgetHeaderClass +
      '">' +
      '<table>' +
      '<thead>' +
      this.rowHtml('head') + // leverages RowRenderer
      '</thead>' +
      '</table>' +
      '</div>'
    );
  },

  // Used by the `headHtml` method, via RowRenderer, for rendering the HTML of a day-of-week header cell
  headCellHtml: function (row, col, date) {
    var view = this.view;
    var calendar = view.calendar;
    var colFormat = view.opt('columnFormat');

    return (
      '' +
      '<th class="fc-day-header ' +
      view.widgetHeaderClass +
      ' fc-' +
      dayIDs[date.day()] +
      '">' +
      htmlEscape(calendar.formatDate(date, colFormat)) +
      '</th>'
    );
  },

  // Renders the HTML for a single-day background cell
  bgCellHtml: function (row, col, date) {
    var view = this.view;
    var classes = this.getDayClasses(date);

    classes.unshift('fc-day', view.widgetContentClass);

    return '<td class="' + classes.join(' ') + '" data-date="' + date.format() + '"></td>';
  },

  // Computes HTML classNames for a single-day cell
  getDayClasses: function (date) {
    var view = this.view;
    var today = view.calendar.getNow().stripTime();
    var classes = ['fc-' + dayIDs[date.day()]];

    if (view.name === 'month' && date.month() != view.intervalStart.month()) {
      classes.push('fc-other-month');
    }

    if (date.isSame(today, 'day')) {
      classes.push('fc-today', view.highlightStateClass);
    } else if (date < today) {
      classes.push('fc-past');
    } else {
      classes.push('fc-future');
    }

    return classes;
  },
});

/* Event-rendering and event-interaction methods for the abstract Grid class
    ----------------------------------------------------------------------------------------------------------------------*/

$.extend(Grid.prototype, {
  isMouseOverSeg: false, // is the user's mouse over a segment?
  isDraggingSeg: false, // is a segment being dragged?
  isResizingSeg: false, // is a segment being resized?

  // Renders the given events onto the grid
  renderEvents: function (events) {
    // subclasses must implement
  },

  // Retrieves all rendered segment objects in this grid
  getSegs: function () {
    // subclasses must implement
  },

  // Unrenders all events
  destroyEvents: function () {
    // subclasses must implement
  },

  // Renders a `el` property for each seg, and only returns segments that successfully rendered
  renderSegs: function (segs, disableResizing) {
    var view = this.view;
    var html = '';
    var renderedSegs = [];
    var i;

    // build a large concatenation of event segment HTML
    for (i = 0; i < segs.length; i++) {
      html += this.renderSegHtml(segs[i], disableResizing);
    }

    // Grab individual elements from the combined HTML string. Use each as the default rendering.
    // Then, compute the 'el' for each segment. An el might be null if the eventRender callback returned false.
    $(html).each(function (i, node) {
      var seg = segs[i];
      var el = view.resolveEventEl(seg.event, $(node));
      if (el) {
        el.data('fc-seg', seg); // used by handlers
        seg.el = el;
        renderedSegs.push(seg);
      }
    });

    return renderedSegs;
  },

  // Generates the HTML for the default rendering of a segment
  renderSegHtml: function (seg, disableResizing) {
    // subclasses must implement
  },

  // Converts an array of event objects into an array of segment objects
  eventsToSegs: function (events, intervalStart, intervalEnd) {
    var _this = this;

    return $.map(events, function (event) {
      return _this.eventToSegs(event, intervalStart, intervalEnd); // $.map flattens all returned arrays together
    });
  },

  // Slices a single event into an array of event segments.
  // When `intervalStart` and `intervalEnd` are specified, intersect the events with that interval.
  // Otherwise, let the subclass decide how it wants to slice the segments over the grid.
  eventToSegs: function (event, intervalStart, intervalEnd) {
    var eventStart = event.start.clone().stripZone(); // normalize
    var eventEnd = this.view.calendar.getEventEnd(event).stripZone(); // compute (if necessary) and normalize
    var segs;
    var i, seg;

    if (intervalStart && intervalEnd) {
      seg = intersectionToSeg(eventStart, eventEnd, intervalStart, intervalEnd);
      segs = seg ? [seg] : [];
    } else {
      segs = this.rangeToSegs(eventStart, eventEnd); // defined by the subclass
    }

    // assign extra event-related properties to the segment objects
    for (i = 0; i < segs.length; i++) {
      seg = segs[i];
      seg.event = event;
      seg.eventStartMS = +eventStart;
      seg.eventDurationMS = eventEnd - eventStart;
    }

    return segs;
  },

  /* Handlers
        ------------------------------------------------------------------------------------------------------------------*/

  // Attaches event-element-related handlers to the container element and leverage bubbling
  bindSegHandlers: function () {
    var _this = this;
    var view = this.view;

    $.each(
      {
        mouseenter: function (seg, ev) {
          _this.triggerSegMouseover(seg, ev);
        },
        mouseleave: function (seg, ev) {
          _this.triggerSegMouseout(seg, ev);
        },
        click: function (seg, ev) {
          return view.trigger('eventClick', this, seg.event, ev); // can return `false` to cancel
        },
        mousedown: function (seg, ev) {
          if ($(ev.target).is('.fc-resizer') && view.isEventResizable(seg.event)) {
            _this.segResizeMousedown(seg, ev);
          } else if (view.isEventDraggable(seg.event)) {
            _this.segDragMousedown(seg, ev);
          }
        },
      },
      function (name, func) {
        // attach the handler to the container element and only listen for real event elements via bubbling
        _this.el.on(name, '.fc-event-container > *', function (ev) {
          var seg = $(this).data('fc-seg'); // grab segment data. put there by View::renderEvents

          // only call the handlers if there is not a drag/resize in progress
          if (seg && !_this.isDraggingSeg && !_this.isResizingSeg) {
            return func.call(this, seg, ev); // `this` will be the event element
          }
        });
      },
    );
  },

  // Updates internal state and triggers handlers for when an event element is moused over
  triggerSegMouseover: function (seg, ev) {
    if (!this.isMouseOverSeg) {
      this.isMouseOverSeg = true;
      this.view.trigger('eventMouseover', seg.el[0], seg.event, ev);
    }
  },

  // Updates internal state and triggers handlers for when an event element is moused out
  triggerSegMouseout: function (seg, ev) {
    if (this.isMouseOverSeg) {
      this.isMouseOverSeg = false;
      this.view.trigger('eventMouseout', seg.el[0], seg.event, ev);
    }
  },

  /* Dragging
        ------------------------------------------------------------------------------------------------------------------*/

  // Called when the user does a mousedown on an event, which might lead to dragging.
  // Generic enough to work with any type of Grid.
  segDragMousedown: function (seg, ev) {
    var _this = this;
    var view = this.view;
    var el = seg.el;
    var event = seg.event;
    var newStart, newEnd;

    // A clone of the original element that will move with the mouse
    var mouseFollower = new MouseFollower(seg.el, {
      parentEl: view.el,
      opacity: view.opt('dragOpacity'),
      revertDuration: view.opt('dragRevertDuration'),
      zIndex: 2, // one above the .fc-view
    });

    // Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
    // of the view.
    var dragListener = new DragListener(view.coordMap, {
      distance: 5,
      scroll: view.opt('dragScroll'),
      listenStart: function (ev) {
        mouseFollower.hide(); // don't show until we know this is a real drag
        mouseFollower.start(ev);
      },
      dragStart: function (ev) {
        _this.triggerSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
        _this.isDraggingSeg = true;
        if (!event.isChildCalendar) {
          view.hideEvent(event); // hide all event segments. our mouseFollower will take over
        }
        view.trigger('eventDragStart', el[0], event, ev, {}); // last argument is jqui dummy
      },
      cellOver: function (cell, date) {
        var origDate = seg.cellDate || dragListener.origDate;
        var res = _this.computeDraggedEventDates(seg, origDate, date);
        newStart = res.start;
        newEnd = res.end;

        if (view.renderDrag(newStart, newEnd, seg)) {
          // have the view render a visual indication
          mouseFollower.hide(); // if the view is already using a mock event "helper", hide our own
        } else {
          mouseFollower.show();
        }
      },
      cellOut: function () {
        // called before mouse moves to a different cell OR moved out of all cells
        newStart = null;
        view.destroyDrag(); // unrender whatever was done in view.renderDrag
        mouseFollower.show(); // show in case we are moving out of all cells
      },
      dragStop: function (ev) {
        var hasChanged = newStart && !newStart.isSame(event.start);

        // do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
        mouseFollower.stop(!hasChanged, function () {
          _this.isDraggingSeg = false;
          view.destroyDrag();
          view.showEvent(event);
          view.trigger('eventDragStop', el[0], event, ev, {}); // last argument is jqui dummy

          if (hasChanged) {
            view.eventDrop(el[0], event, newStart, ev); // will rerender all events...

            if ($.browser.safari && window.localStorage.getItem('lastView') === 'month') {
              $('.fc-month-view').css('position', 'static');
            } else {
              $('.fc-month-view').css('position', 'relative');
            }
          }
        });
      },
      listenStop: function () {
        mouseFollower.stop(); // put in listenStop in case there was a mousedown but the drag never started
      },
    });

    dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
  },

  // Given a segment, the dates where a drag began and ended, calculates the Event Object's new start and end dates
  computeDraggedEventDates: function (seg, dragStartDate, dropDate) {
    var view = this.view;
    var event = seg.event;
    var start = event.start;
    var end = view.calendar.getEventEnd(event);
    var delta;
    var newStart;
    var newEnd;

    if (dropDate.hasTime() === dragStartDate.hasTime()) {
      delta = dayishDiff(dropDate, dragStartDate);
      newStart = start.clone().add(delta);
      if (event.end === null) {
        // do we need to compute an end?
        newEnd = null;
      } else {
        newEnd = end.clone().add(delta);
      }
    } else {
      // if switching from day <-> timed, start should be reset to the dropped date, and the end cleared
      newStart = dropDate;
      newEnd = null; // end should be cleared
    }

    return { start: newStart, end: newEnd };
  },

  /* Resizing
        ------------------------------------------------------------------------------------------------------------------*/

  // Called when the user does a mousedown on an event's resizer, which might lead to resizing.
  // Generic enough to work with any type of Grid.
  segResizeMousedown: function (seg, ev) {
    var _this = this;
    var view = this.view;
    var el = seg.el;
    var event = seg.event;
    var start = event.start;
    var end = view.calendar.getEventEnd(event);
    var newEnd = null;
    var dragListener;

    function destroy() {
      // resets the rendering
      _this.destroyResize();
      view.showEvent(event);
    }

    // Tracks mouse movement over the *grid's* coordinate map
    dragListener = new DragListener(this.coordMap, {
      distance: 5,
      scroll: view.opt('dragScroll'),
      dragStart: function (ev) {
        _this.triggerSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
        _this.isResizingSeg = true;
        view.trigger('eventResizeStart', el[0], event, ev, {}); // last argument is jqui dummy
      },
      cellOver: function (cell, date) {
        // compute the new end. don't allow it to go before the event's start
        if (date.isBefore(start)) {
          // allows comparing ambig to non-ambig
          date = start;
        }
        newEnd = date.clone().add(_this.cellDuration); // make it an exclusive end

        if (newEnd.isSame(end)) {
          newEnd = null;
          destroy();
        } else {
          _this.renderResize(start, newEnd, seg);
          view.hideEvent(event);
        }
      },
      cellOut: function () {
        // called before mouse moves to a different cell OR moved out of all cells
        newEnd = null;
        destroy();
      },
      dragStop: function (ev) {
        _this.isResizingSeg = false;
        destroy();
        view.trigger('eventResizeStop', el[0], event, ev, {}); // last argument is jqui dummy

        if (newEnd) {
          view.eventResize(el[0], event, newEnd, ev); // will rerender all events...

          if ($.browser.safari && window.localStorage.getItem('lastView') === 'month') {
            $('.fc-month-view').css('position', 'static');
          } else {
            $('.fc-month-view').css('position', 'relative');
          }
        }
      },
    });

    dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
  },

  /* Rendering Utils
        ------------------------------------------------------------------------------------------------------------------*/

  // Generic utility for generating the HTML classNames for an event segment's element
  getSegClasses: function (seg, isDraggable, isResizable) {
    var event = seg.event;
    var classes = ['fc-event', seg.isStart ? 'fc-start' : 'fc-not-start', seg.isEnd ? 'fc-end' : 'fc-not-end'].concat(
      event.className,
      event.source ? event.source.className : [],
    );

    if (isDraggable) {
      classes.push('fc-draggable');
    }
    if (isResizable) {
      classes.push('fc-resizable');
    }

    return classes;
  },

  // Utility for generating a CSS string with all the event skin-related properties
  getEventSkinCss: function (event) {
    var view = this.view;
    var source = event.source || {};
    var eventColor = event.color;
    var sourceColor = source.color;
    var optionColor = view.opt('eventColor');
    var backgroundColor =
      event.backgroundColor ||
      eventColor ||
      source.backgroundColor ||
      sourceColor ||
      view.opt('eventBackgroundColor') ||
      optionColor;
    var borderColor =
      event.borderColor ||
      eventColor ||
      source.borderColor ||
      sourceColor ||
      view.opt('eventBorderColor') ||
      optionColor;
    var textColor = event.textColor || source.textColor || view.opt('eventTextColor');
    var statements = [];
    if (backgroundColor) {
      statements.push('background-color:' + backgroundColor);
    }
    if (borderColor) {
      statements.push('border-color:' + borderColor);
    }
    if (textColor) {
      statements.push('color:' + textColor);
    }
    return statements.join(';');
  },
});

/* Event Segment Utilities
    ----------------------------------------------------------------------------------------------------------------------*/

// A cmp function for determining which segments should take visual priority
function compareSegs(seg1, seg2) {
  return (
    seg1.eventStartMS - seg2.eventStartMS || // earlier events go first
    seg2.eventDurationMS - seg1.eventDurationMS || // tie? longer events go first
    seg2.event.allDay - seg1.event.allDay
  ); //|| tie? put all-day events first (booleans cast to 0/1)
  //(seg1.event.title || '').localeCompare(seg2.event.title);  tie? alphabetically by title
}

/* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
    ----------------------------------------------------------------------------------------------------------------------*/

function DayGrid(view) {
  Grid.call(this, view); // call the super-constructor
}

DayGrid.prototype = createObject(Grid.prototype); // declare the super-class
$.extend(DayGrid.prototype, {
  numbersVisible: false, // should render a row for day/week numbers? manually set by the view
  cellDuration: moment.duration({ days: 1 }), // required for Grid.event.js. Each cell is always a single day
  bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid

  rowEls: null, // set of fake row elements
  dayEls: null, // set of whole-day elements comprising the row's background
  helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"
  highlightEls: null, // set of cell skeleton elements for rendering the highlight

  // Renders the rows and columns into the component's `this.el`, which should already be assigned.
  // isRigid determins whether the individual rows should ignore the contents and be a constant height.
  // Relies on the view's colCnt and rowCnt. In the future, this component should probably be self-sufficient.
  render: function (isRigid) {
    var view = this.view;
    var html = '';
    var row;

    for (row = 0; row < view.rowCnt; row++) {
      html += this.dayRowHtml(row, isRigid);
    }
    this.el.html(html);

    this.rowEls = this.el.find('.fc-row');
    this.dayEls = this.el.find('.fc-day');

    // run all the day cells through the dayRender callback
    this.dayEls.each(function (i, node) {
      var date = view.cellToDate(Math.floor(i / view.colCnt), i % view.colCnt);
      view.trigger('dayRender', null, date, $(node));
    });

    Grid.prototype.render.call(this); // call the super-method
  },

  destroy: function () {
    this.destroySegPopover();
  },

  // Generates the HTML for a single row. `row` is the row number.
  dayRowHtml: function (row, isRigid) {
    var view = this.view;
    var classes = ['fc-row', 'fc-week', view.widgetContentClass];

    if (isRigid) {
      classes.push('fc-rigid');
    }

    return (
      '' +
      '<div class="' +
      classes.join(' ') +
      '">' +
      '<div class="fc-bg">' +
      '<table>' +
      this.rowHtml('day', row) + // leverages RowRenderer. calls dayCellHtml()
      '</table>' +
      '</div>' +
      '<div class="fc-content-skeleton">' +
      '<table>' +
      (this.numbersVisible
        ? '<thead>' +
          this.rowHtml('number', row) + // leverages RowRenderer. View will define render method
          '</thead>'
        : '') +
      '</table>' +
      '</div>' +
      '</div>'
    );
  },

  // Renders the HTML for a whole-day cell. Will eventually end up in the day-row's background.
  // We go through a 'day' row type instead of just doing a 'bg' row type so that the View can do custom rendering
  // specifically for whole-day rows, whereas a 'bg' might also be used for other purposes (TimeGrid bg for example).
  dayCellHtml: function (row, col, date) {
    return this.bgCellHtml(row, col, date);
  },

  /* Coordinates & Cells
        ------------------------------------------------------------------------------------------------------------------*/

  // Populates the empty `rows` and `cols` arrays with coordinates of the cells. For CoordGrid.
  buildCoords: function (rows, cols) {
    var colCnt = this.view.colCnt;
    var e, n, p;

    this.dayEls.slice(0, colCnt).each(function (i, _e) {
      // iterate the first row of day elements
      e = $(_e);
      n = e.offset().left;
      if (i) {
        p[1] = n;
      }
      p = [n];
      cols[i] = p;
    });
    p[1] = n + e.outerWidth();

    this.rowEls.each(function (i, _e) {
      e = $(_e);
      n = e.offset().top;
      if (i) {
        p[1] = n;
      }
      p = [n];
      rows[i] = p;
    });
    p[1] = n + e.outerHeight() + this.bottomCoordPadding; // hack to extend hit area of last row
  },

  // Converts a cell to a date
  getCellDate: function (cell) {
    return this.view.cellToDate(cell); // leverages the View's cell system
  },

  // Gets the whole-day element associated with the cell
  getCellDayEl: function (cell) {
    return this.dayEls.eq(cell.row * this.view.colCnt + cell.col);
  },

  // Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
  rangeToSegs: function (start, end) {
    return this.view.rangeToSegments(start, end); // leverages the View's cell system
  },

  /* Event Drag Visualization
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event hovering over the given date(s).
  // `end` can be null, as well as `seg`. See View's documentation on renderDrag for more info.
  // A returned value of `true` signals that a mock "helper" event has been rendered.
  renderDrag: function (start, end, seg) {
    var opacity;

    // always render a highlight underneath
    this.renderHighlight(start, end || this.view.calendar.getDefaultEventEnd(true, start));

    // if a segment from the same calendar but another component is being dragged, render a helper event
    if (seg && !seg.el.closest(this.el).length) {
      this.renderRangeHelper(start, end, seg);

      opacity = this.view.opt('dragOpacity');
      if (opacity !== undefined) {
        this.helperEls.css('opacity', opacity);
      }

      return true; // a helper has been rendered
    }
  },

  // Unrenders any visual indication of a hovering event
  destroyDrag: function () {
    this.destroyHighlight();
    this.destroyHelper();
  },

  /* Event Resize Visualization
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being resized
  renderResize: function (start, end, seg) {
    this.renderHighlight(start, end);
    this.renderRangeHelper(start, end, seg);
  },

  // Unrenders a visual indication of an event being resized
  destroyResize: function () {
    this.destroyHighlight();
    this.destroyHelper();
  },

  /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
  renderHelper: function (event, sourceSeg) {
    var helperNodes = [];
    var rowStructs = this.renderEventRows([event]);

    // inject each new event skeleton into each associated row
    this.rowEls.each(function (row, rowNode) {
      var rowEl = $(rowNode); // the .fc-row
      var skeletonEl = $('<div class="fc-helper-skeleton"><table/></div>'); // will be absolutely positioned
      var skeletonTop;

      // If there is an original segment, match the top position. Otherwise, put it at the row's top level
      if (sourceSeg && sourceSeg.row === row) {
        skeletonTop = sourceSeg.el.position().top;
      } else {
        skeletonTop = (rowEl.find('.fc-content-skeleton tbody').position() || {}).top;
      }

      skeletonEl.css('top', skeletonTop).find('table').append(rowStructs[row].tbodyEl);

      rowEl.append(skeletonEl);
      helperNodes.push(skeletonEl[0]);
    });

    this.helperEls = $(helperNodes); // array -> jQuery set
  },

  // Unrenders any visual indication of a mock helper event
  destroyHelper: function () {
    if (this.helperEls) {
      this.helperEls.remove();
      this.helperEls = null;
    }
  },

  /* Highlighting
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders an emphasis on the given date range. `start` is an inclusive, `end` is exclusive.
  renderHighlight: function (start, end) {
    var segs = this.rangeToSegs(start, end);
    var highlightNodes = [];
    var i, seg;
    var el;

    // build an event skeleton for each row that needs it
    for (i = 0; i < segs.length; i++) {
      seg = segs[i];
      el = $(
        this.highlightSkeletonHtml(seg.leftCol, seg.rightCol + 1), // make end exclusive
      );
      el.appendTo(this.rowEls[seg.row]);
      highlightNodes.push(el[0]);
    }

    this.highlightEls = $(highlightNodes); // array -> jQuery set
  },

  // Unrenders any visual emphasis on a date range
  destroyHighlight: function () {
    if (this.highlightEls) {
      this.highlightEls.remove();
      this.highlightEls = null;
    }
  },

  // Generates the HTML used to build a single-row "highlight skeleton", a table that frames highlight cells
  highlightSkeletonHtml: function (startCol, endCol) {
    var colCnt = this.view.colCnt;
    var cellHtml = '';

    if (startCol > 0) {
      cellHtml += '<td colspan="' + startCol + '"/>';
    }
    if (endCol > startCol) {
      cellHtml += '<td colspan="' + (endCol - startCol) + '" class="fc-highlight" />';
    }
    if (colCnt > endCol) {
      cellHtml += '<td colspan="' + (colCnt - endCol) + '"/>';
    }

    cellHtml = this.bookendCells(cellHtml, 'highlight');

    return '' + '<div class="fc-highlight-skeleton">' + '<table>' + '<tr>' + cellHtml + '</tr>' + '</table>' + '</div>';
  },
});

/* Event-rendering methods for the DayGrid class
    ----------------------------------------------------------------------------------------------------------------------*/

$.extend(DayGrid.prototype, {
  segs: null,
  rowStructs: null, // an array of objects, each holding information about a row's event-rendering

  // Render the given events onto the Grid and return the rendered segments
  renderEvents: function (events) {
    var rowStructs = (this.rowStructs = this.renderEventRows(events));
    var segs = [];

    // append to each row's content skeleton
    this.rowEls.each(function (i, rowNode) {
      $(rowNode).find('.fc-content-skeleton > table').append(rowStructs[i].tbodyEl);
      segs.push.apply(segs, rowStructs[i].segs);
    });

    this.segs = segs;
  },

  // Retrieves all segment objects that have been rendered
  getSegs: function () {
    return (this.segs || []).concat(
      this.popoverSegs || [], // segs rendered in the "more" events popover
    );
  },

  // Removes all rendered event elements
  destroyEvents: function () {
    var rowStructs = this.rowStructs || [];
    var rowStruct;

    while ((rowStruct = rowStructs.pop())) {
      rowStruct.tbodyEl.remove();
    }

    this.segs = null;
    this.destroySegPopover(); // removes the "more.." events popover
  },

  // Uses the given events array to generate <tbody> elements that should be appended to each row's content skeleton.
  // Returns an array of rowStruct objects (see the bottom of `renderEventRow`).
  renderEventRows: function (events) {
    var segs = this.eventsToSegs(events);
    var rowStructs = [];
    var segRows;
    var row;

    segs = this.renderSegs(segs); // returns a new array with only visible segments
    segRows = this.groupSegRows(segs); // group into nested arrays

    // iterate each row of segment groupings
    for (row = 0; row < segRows.length; row++) {
      rowStructs.push(this.renderEventRow(row, segRows[row]));
    }

    return rowStructs;
  },

  // Builds the HTML to be used for the default element for an individual segment
  renderSegHtml: function (seg, disableResizing) {
    var view = this.view;
    var isRTL = view.opt('isRTL');
    var event = seg.event;
    var isDraggable = view.isEventDraggable(event);
    var isResizable = !disableResizing && event.allDay && seg.isEnd && view.isEventResizable(event);
    var classes = this.getSegClasses(seg, isDraggable, isResizable);
    var skinCss = this.getEventSkinCss(event);
    var timeHtml = '';
    var titleHtml;
    var hoverBgColor = null;

    classes.unshift('fc-day-grid-event');

    var backgroundColor = function (skinCss) {
      if (skinCss.indexOf('#EF9A9A') >= 0)
        //红色
        return 'background:#F44336';
      if (skinCss.indexOf('#CE93D8') >= 0)
        //紫色
        return 'background:#9C27B0';
      if (skinCss.indexOf('#BCAAA4') >= 0)
        //褐色
        return 'background:#795548';
      if (skinCss.indexOf('#FFCC80') >= 0)
        //橙色
        return 'background:#FF9800';
      if (skinCss.indexOf('#90CAF9') >= 0)
        //蓝色
        return 'background:#1E88E5';
      if (skinCss.indexOf('#A5D6A7') >= 0)
        //绿色
        return 'background:#4CAF50';
      if (skinCss.indexOf('#FFF59D') >= 0)
        //黄色
        return 'background:#FFEB3B';
      if (skinCss.indexOf('#E6E6E6') >= 0)
        //灰色
        return 'background:#B4B4B4';
    };

    // Only display a timed events time if it is the starting segment
    if (view.name == 'month') {
      if (!event.isAllDay && seg.isStart) {
        var startTime = moment(event.startTime).format('HH:mm');
        var endTime = moment(event.endTime).format('HH:mm');
        if (moment(event.startTime).format('YYYY-MM-DD') != moment(event.endTime).format('YYYY-MM-DD'))
          timeHtml =
            '<span class="fc-time" data-start="' + startTime + '" data-end="' + endTime + '">' + startTime + '</span>';
        else {
          timeHtml =
            '<span class="notAllDayMark" style="' +
            backgroundColor(skinCss) +
            '"></span> <span class="fc-time" data-start="' +
            startTime +
            '" data-end="' +
            endTime +
            '">' +
            startTime +
            '</span>';

          hoverBgColor = backgroundColor(skinCss);
          skinCss = skinCss.split(';')[skinCss.split(';').length - 1];
        }
      }
    }

    titleHtml =
      '<span class="fc-title">' +
      (event.isTask ? event.title : htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
      '</span>';

    if (
      view.name !== 'month' &&
      !event.isAllDay &&
      seg.isStart &&
      moment(event.startTime).format('YYYY-MM-DD') != moment(event.endTime).format('YYYY-MM-DD')
    ) {
      titleHtml =
        '<span class="fc-title">' +
        (event.isTask ? event.title : htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
        '</span>';
    }

    titleHtml = titleHtml.replace(_l('(全天)'), "<span class='fcTitleFont'>" + _l('(全天)') + '</span>');

    var bgClass = event.allDay ? ' showActiveTitle' : ' showActiveTitle notAllDayOver';
    if ((moment(event.end) - moment(event.start)) / (24 * 60 * 60 * 1000) > 1) bgClass = ' showActiveTitle';

    return (
      '<a class="' +
      classes.join(' ') +
      bgClass +
      '" data-hoverBgColor="' +
      hoverBgColor +
      '"' +
      (event.url ? ' href="' + htmlEscape(event.url) + '"' : '') +
      (skinCss ? ' style="' + skinCss + '"' : '') +
      '>' +
      '<div class="fc-content">' +
      (isRTL // put a natural space in between
        ? titleHtml + ' ' + timeHtml
        : timeHtml + ' ' + titleHtml) + //
      '</div>' +
      (isResizable ? '<div class="fc-resizer"/>' : '') +
      '</a>'
    );
  },

  // Given a row # and an array of segments all in the same row, render a <tbody> element, a skeleton that contains
  // the segments. Returns object with a bunch of internal data about how the render was calculated.
  renderEventRow: function (row, rowSegs) {
    var view = this.view;
    var colCnt = view.colCnt;
    var segLevels = this.buildSegLevels(rowSegs); // group into sub-arrays of levels
    var levelCnt = Math.max(1, segLevels.length); // ensure at least one level
    var tbody = $('<tbody/>');
    var segMatrix = []; // lookup for which segments are rendered into which level+col cells
    var cellMatrix = []; // lookup for all <td> elements of the level+col matrix
    var loneCellMatrix = []; // lookup for <td> elements that only take up a single column
    var i, levelSegs;
    var col;
    var tr;
    var j, seg;
    var td;

    // populates empty cells from the current column (`col`) to `endCol`
    function emptyCellsUntil(endCol) {
      while (col < endCol) {
        // try to grab a cell from the level above and extend its rowspan. otherwise, create a fresh cell
        td = (loneCellMatrix[i - 1] || [])[col];
        if (td) {
          td.attr('rowspan', parseInt(td.attr('rowspan') || 1, 10) + 1);
        } else {
          td = $('<td/>');
          tr.append(td);
        }
        cellMatrix[i][col] = td;
        loneCellMatrix[i][col] = td;
        col++;
      }
    }

    for (i = 0; i < levelCnt; i++) {
      // iterate through all levels
      levelSegs = segLevels[i];
      col = 0;
      tr = $('<tr/>');

      segMatrix.push([]);
      cellMatrix.push([]);
      loneCellMatrix.push([]);

      // levelCnt might be 1 even though there are no actual levels. protect against this.
      // this single empty row is useful for styling.
      if (levelSegs) {
        for (j = 0; j < levelSegs.length; j++) {
          // iterate through segments in level
          seg = levelSegs[j];

          emptyCellsUntil(seg.leftCol);

          // create a container that occupies or more columns. append the event element.
          td = $('<td class="fc-event-container"/>').append(seg.el);
          if (seg.leftCol != seg.rightCol) {
            td.attr('colspan', seg.rightCol - seg.leftCol + 1);
          } else {
            // a single-column segment
            loneCellMatrix[i][col] = td;
          }

          while (col <= seg.rightCol) {
            cellMatrix[i][col] = td;
            segMatrix[i][col] = seg;
            col++;
          }

          tr.append(td);
        }
      }

      emptyCellsUntil(colCnt); // finish off the row
      this.bookendCells(tr, 'eventSkeleton');
      tbody.append(tr);
    }

    return {
      // a "rowStruct"
      row: row, // the row number
      tbodyEl: tbody,
      cellMatrix: cellMatrix,
      segMatrix: segMatrix,
      segLevels: segLevels,
      segs: rowSegs,
    };
  },

  // Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
  buildSegLevels: function (segs) {
    var levels = [];
    var i, seg;
    var j;

    // Give preference to elements with certain criteria, so they have
    // a chance to be closer to the top.
    segs.sort(compareSegs);

    for (i = 0; i < segs.length; i++) {
      seg = segs[i];

      // loop through levels, starting with the topmost, until the segment doesn't collide with other segments
      for (j = 0; j < levels.length; j++) {
        if (!isDaySegCollision(seg, levels[j])) {
          break;
        }
      }
      // `j` now holds the desired subrow index
      seg.level = j;

      // create new level array if needed and append segment
      (levels[j] || (levels[j] = [])).push(seg);
    }

    // order segments left-to-right. very important if calendar is RTL
    for (j = 0; j < levels.length; j++) {
      levels[j].sort(compareDaySegCols);
    }

    return levels;
  },

  // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's row
  groupSegRows: function (segs) {
    var view = this.view;
    var segRows = [];
    var i;

    for (i = 0; i < view.rowCnt; i++) {
      segRows.push([]);
    }

    for (i = 0; i < segs.length; i++) {
      segRows[segs[i].row].push(segs[i]);
    }

    return segRows;
  },
});

// Computes whether two segments' columns collide. They are assumed to be in the same row.
function isDaySegCollision(seg, otherSegs) {
  var i, otherSeg;

  for (i = 0; i < otherSegs.length; i++) {
    otherSeg = otherSegs[i];

    if (otherSeg.leftCol <= seg.rightCol && otherSeg.rightCol >= seg.leftCol) {
      return true;
    }
  }

  return false;
}

// A cmp function for determining the leftmost event
function compareDaySegCols(a, b) {
  return a.leftCol - b.leftCol;
}

/* Methods relate to limiting the number events for a given day on a DayGrid
    ----------------------------------------------------------------------------------------------------------------------*/

$.extend(DayGrid.prototype, {
  segPopover: null, // the Popover that holds events that can't fit in a cell. null when not visible
  popoverSegs: null, // an array of segment objects that the segPopover holds. null when not visible

  destroySegPopover: function () {
    if (this.segPopover) {
      this.segPopover.hide(); // will trigger destruction of `segPopover` and `popoverSegs`
    }
  },

  // Limits the number of "levels" (vertically stacking layers of events) for each row of the grid.
  // `levelLimit` can be false (don't limit), a number, or true (should be computed).
  limitRows: function (levelLimit) {
    var rowStructs = this.rowStructs || [];
    var row; // row #
    var rowLevelLimit;

    for (row = 0; row < rowStructs.length; row++) {
      this.unlimitRow(row);

      if (!levelLimit) {
        rowLevelLimit = false;
      } else if (typeof levelLimit === 'number') {
        rowLevelLimit = levelLimit;
      } else {
        rowLevelLimit = this.computeRowLevelLimit(row);
      }

      if (rowLevelLimit !== false) {
        this.limitRow(row, rowLevelLimit);
      }
    }
  },

  // Computes the number of levels a row will accomodate without going outside its bounds.
  // Assumes the row is "rigid" (maintains a constant height regardless of what is inside).
  // `row` is the row number.
  computeRowLevelLimit: function (row) {
    var rowEl = this.rowEls.eq(row); // the containing "fake" row div
    var rowHeight = rowEl.height(); // TODO: cache somehow?
    var trEls = this.rowStructs[row].tbodyEl.children();
    var i, trEl;

    // Reveal one level <tr> at a time and stop when we find one out of bounds
    for (i = 0; i < trEls.length; i++) {
      trEl = trEls.eq(i).removeClass('fc-limited'); // get and reveal
      if (trEl.position().top + trEl.outerHeight() > rowHeight) {
        return i;
      }
    }

    return false; // should not limit at all
  },

  // Limits the given grid row to the maximum number of levels and injects "more" links if necessary.
  // `row` is the row number.
  // `levelLimit` is a number for the maximum (inclusive) number of levels allowed.
  limitRow: function (row, levelLimit) {
    var _this = this;
    var view = this.view;
    var rowStruct = this.rowStructs[row];
    var moreNodes = []; // array of "more" <a> links and <td> DOM nodes
    var col = 0; // col #
    var cell;
    var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right
    var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row
    var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes
    var i, seg;
    var segsBelow; // array of segment objects below `seg` in the current `col`
    var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies
    var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)
    var td, rowspan;
    var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell
    var j;
    var moreTd, moreWrap, moreLink;

    // Iterates through empty level cells and places "more" links inside if need be
    function emptyCellsUntil(endCol) {
      // goes from current `col` to `endCol`
      while (col < endCol) {
        cell = { row: row, col: col };
        segsBelow = _this.getCellSegs(cell, levelLimit);
        if (segsBelow.length) {
          td = cellMatrix[levelLimit - 1][col];
          moreLink = _this.renderMoreLink(cell, segsBelow);
          moreWrap = $('<div/>').append(moreLink);
          td.append(moreWrap);
          moreNodes.push(moreWrap[0]);
        }
        col++;
      }
    }

    if (levelLimit && levelLimit < rowStruct.segLevels.length) {
      // is it actually over the limit?
      levelSegs = rowStruct.segLevels[levelLimit - 1];
      cellMatrix = rowStruct.cellMatrix;

      limitedNodes = rowStruct.tbodyEl
        .children()
        .slice(levelLimit) // get level <tr> elements past the limit
        .addClass('fc-limited')
        .get(); // hide elements and get a simple DOM-nodes array

      // iterate though segments in the last allowable level
      for (i = 0; i < levelSegs.length; i++) {
        seg = levelSegs[i];
        emptyCellsUntil(seg.leftCol); // process empty cells before the segment

        // determine *all* segments below `seg` that occupy the same columns
        colSegsBelow = [];
        totalSegsBelow = 0;
        while (col <= seg.rightCol) {
          cell = { row: row, col: col };
          segsBelow = this.getCellSegs(cell, levelLimit);
          colSegsBelow.push(segsBelow);
          totalSegsBelow += segsBelow.length;
          col++;
        }

        if (totalSegsBelow) {
          // do we need to replace this segment with one or many "more" links?
          td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell
          rowspan = td.attr('rowspan') || 1;
          segMoreNodes = [];

          // make a replacement <td> for each column the segment occupies. will be one for each colspan
          for (j = 0; j < colSegsBelow.length; j++) {
            moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);
            segsBelow = colSegsBelow[j];
            cell = { row: row, col: seg.leftCol + j };
            moreLink = this.renderMoreLink(cell, [seg].concat(segsBelow)); // count seg as hidden too
            moreWrap = $('<div/>').append(moreLink);
            moreTd.append(moreWrap);
            segMoreNodes.push(moreTd[0]);
            moreNodes.push(moreTd[0]);
          }

          td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements
          limitedNodes.push(td[0]);
        }
      }

      emptyCellsUntil(view.colCnt); // finish off the level
      rowStruct.moreEls = $(moreNodes); // for easy undoing later
      rowStruct.limitedEls = $(limitedNodes); // for easy undoing later
    }
  },

  // Reveals all levels and removes all "more"-related elements for a grid's row.
  // `row` is a row number.
  unlimitRow: function (row) {
    var rowStruct = this.rowStructs[row];

    if (rowStruct.moreEls) {
      rowStruct.moreEls.remove();
      rowStruct.moreEls = null;
    }

    if (rowStruct.limitedEls) {
      rowStruct.limitedEls.removeClass('fc-limited');
      rowStruct.limitedEls = null;
    }
  },

  // Renders an <a> element that represents hidden event element for a cell.
  // Responsible for attaching click handler as well.
  renderMoreLink: function (cell, hiddenSegs) {
    var _this = this;
    var view = this.view;

    return $('<a class="fc-more"/>')
      .text(this.getMoreLinkText(hiddenSegs.length))
      .on('click', function (ev) {
        var clickOption = view.opt('eventLimitClick');
        var date = view.cellToDate(cell);
        var moreEl = $(this);
        var dayEl = _this.getCellDayEl(cell);
        var allSegs = _this.getCellSegs(cell);

        // rescope the segments to be within the cell's date
        var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);
        var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);

        if (typeof clickOption === 'function') {
          // the returned value can be an atomic option
          clickOption = view.trigger(
            'eventLimitClick',
            null,
            {
              date: date,
              dayEl: dayEl,
              moreEl: moreEl,
              segs: reslicedAllSegs,
              hiddenSegs: reslicedHiddenSegs,
            },
            ev,
          );
        }

        if (clickOption === 'popover') {
          _this.showSegPopover(date, cell, moreEl, reslicedAllSegs);
        } else if (typeof clickOption === 'string') {
          // a view name
          view.calendar.zoomTo(date, clickOption);
        }
      });
  },

  // Reveals the popover that displays all events within a cell
  showSegPopover: function (date, cell, moreLink, segs) {
    var _this = this;
    var view = this.view;
    var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>
    var topEl; // the element we want to match the top coordinate of
    var options;

    if (view.rowCnt == 1) {
      topEl = this.view.el; // will cause the popover to cover any sort of header
    } else {
      topEl = this.rowEls.eq(cell.row); // will align with top of row
    }

    options = {
      className: 'fc-more-popover',
      content: this.renderSegPopoverContent(date, segs),
      parentEl: this.el,
      top: topEl.offset().top,
      autoHide: true, // when the user clicks elsewhere, hide the popover
      viewportConstrain: view.opt('popoverViewportConstrain'),
      hide: function () {
        // destroy everything when the popover is hidden
        _this.segPopover.destroy();
        _this.segPopover = null;
        _this.popoverSegs = null;
      },
    };

    // Determine horizontal coordinate.
    // We use the moreWrap instead of the <td> to avoid border confusion.
    if (view.opt('isRTL')) {
      options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
    } else {
      options.left = moreWrap.offset().left - 1; // -1 to be over cell border
    }

    this.segPopover = new Popover(options);
    this.segPopover.show();
  },

  // Builds the inner DOM contents of the segment popover
  renderSegPopoverContent: function (date, segs) {
    var view = this.view;
    var isTheme = view.opt('theme');
    var title = date.format(view.opt('dayPopoverFormat'));
    var content = $(
      '<div class="fc-header ' +
        view.widgetHeaderClass +
        '">' +
        '<span class="fc-close ' +
        (isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +
        '"></span>' +
        '<span class="fc-title">' +
        htmlEscape(title) +
        '</span>' +
        '<div class="fc-clear"/>' +
        '</div>' +
        '<div class="fc-body ' +
        view.widgetContentClass +
        '">' +
        '<div class="fc-event-container"></div>' +
        '</div>',
    );
    var segContainer = content.find('.fc-event-container');
    var i;

    // render each seg's `el` and only return the visible segs
    segs = this.renderSegs(segs, true); // disableResizing=true
    this.popoverSegs = segs;

    for (i = 0; i < segs.length; i++) {
      // because segments in the popover are not part of a grid coordinate system, provide a hint to any
      // grids that want to do drag-n-drop about which cell it came from
      segs[i].cellDate = date;

      segContainer.append(segs[i].el);

      if (segs[i].event.isTask) {
        segContainer
          .find('.fc-title')
          .eq(i)
          .prepend(
            '<span class="icon-calendartask" style="width:14px;display: inline-block;height:14px;margin: 1px 3px -2px 0;font-size: 16px;vertical-align: top;"> </span>',
          );
      }

      if ($('#tb_OtherUserCalendar .addOtherUser').length > 0) {
        segContainer
          .find('.fc-title')
          .eq(i)
          .prepend(
            '<img src="' +
              segs[i].event.head +
              '" style="width:14px;margin-top: 1px; height:14px;margin-bottom:-2px;padding-right: 3px;">',
          );
      }
    }

    return content;
  },

  // Given the events within an array of segment objects, reslice them to be in a single day
  resliceDaySegs: function (segs, dayDate) {
    var events = $.map(segs, function (seg) {
      return seg.event;
    });
    var dayStart = dayDate.clone().stripTime();
    var dayEnd = dayStart.clone().add(1, 'days');

    return this.eventsToSegs(events, dayStart, dayEnd);
  },

  // Generates the text that should be inside a "more" link, given the number of events it represents
  getMoreLinkText: function (num) {
    var view = this.view;
    var opt = view.opt('eventLimitText');

    if (typeof opt === 'function') {
      return opt(num);
    } else {
      return '+' + num + ' ' + opt;
    }
  },

  // Returns segments within a given cell.
  // If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
  getCellSegs: function (cell, startLevel) {
    var segMatrix = this.rowStructs[cell.row].segMatrix;
    var level = startLevel || 0;
    var segs = [];
    var seg;

    while (level < segMatrix.length) {
      seg = segMatrix[level][cell.col];
      if (seg) {
        segs.push(seg);
      }
      level++;
    }

    return segs;
  },
});

/* A component that renders one or more columns of vertical time slots
    ----------------------------------------------------------------------------------------------------------------------*/

function TimeGrid(view) {
  Grid.call(this, view); // call the super-constructor
}

TimeGrid.prototype = createObject(Grid.prototype); // define the super-class
$.extend(TimeGrid.prototype, {
  slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
  snapDuration: null, // granularity of time for dragging and selecting

  minTime: null, // Duration object that denotes the first visible time of any given day
  maxTime: null, // Duration object that denotes the exclusive visible end time of any given day

  dayEls: null, // cells elements in the day-row background
  slatEls: null, // elements running horizontally across all columns

  slatTops: null, // an array of top positions, relative to the container. last item holds bottom of last slot

  highlightEl: null, // cell skeleton element for rendering the highlight
  helperEl: null, // cell skeleton element for rendering the mock event "helper"

  // Renders the time grid into `this.el`, which should already be assigned.
  // Relies on the view's colCnt. In the future, this component should probably be self-sufficient.
  render: function () {
    this.processOptions();

    this.el.html(this.renderHtml());

    this.dayEls = this.el.find('.fc-day');
    this.slatEls = this.el.find('.fc-slats tr');

    this.computeSlatTops();

    Grid.prototype.render.call(this); // call the super-method
  },

  // Renders the basic HTML skeleton for the grid
  renderHtml: function () {
    return (
      '' +
      '<div class="fc-bg">' +
      '<table>' +
      this.rowHtml('slotBg') + // leverages RowRenderer, which will call slotBgCellHtml
      '</table>' +
      '</div>' +
      '<div class="fc-slats">' +
      '<table>' +
      this.slatRowHtml() +
      '</table>' +
      '</div>'
    );
  },

  // Renders the HTML for a vertical background cell behind the slots.
  // This method is distinct from 'bg' because we wanted a new `rowType` so the View could customize the rendering.
  slotBgCellHtml: function (row, col, date) {
    return this.bgCellHtml(row, col, date);
  },

  // Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
  slatRowHtml: function () {
    var view = this.view;
    var calendar = view.calendar;
    var isRTL = view.opt('isRTL');
    var html = '';
    var slotNormal = this.slotDuration.asMinutes() % 15 === 0;
    var slotTime = moment.duration(+this.minTime); // wish there was .clone() for durations
    var slotDate; // will be on the view's first day, but we only care about its time
    var minutes;
    var axisHtml;

    // Calculate the time for each slot
    while (slotTime < this.maxTime) {
      slotDate = view.start.clone().time(slotTime); // will be in UTC but that's good. to avoid DST issues
      minutes = slotDate.minutes();

      axisHtml =
        '<td class="fc-axis fc-time ' +
        view.widgetContentClass +
        '" ' +
        view.axisStyleAttr() +
        '>' +
        (!slotNormal || !minutes // if irregular slot duration, or on the hour, then display the time
          ? '<span>' + // for matchCellWidths
            htmlEscape(calendar.formatDate(slotDate, view.opt('axisFormat'))) +
            '</span>'
          : '') +
        '</td>';

      html +=
        '<tr ' +
        (!minutes ? '' : 'class="fc-minor"') +
        '>' +
        (!isRTL ? axisHtml : '') +
        '<td class="' +
        view.widgetContentClass +
        '"/>' +
        (isRTL ? axisHtml : '') +
        '</tr>';

      slotTime.add(this.slotDuration);
    }

    return html;
  },

  // Parses various options into properties of this object
  processOptions: function () {
    var view = this.view;
    var slotDuration = view.opt('slotDuration');
    var snapDuration = view.opt('snapDuration');

    slotDuration = moment.duration(slotDuration);
    snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;

    this.slotDuration = slotDuration;
    this.snapDuration = snapDuration;
    this.cellDuration = snapDuration; // important to assign this for Grid.events.js

    this.minTime = moment.duration(view.opt('minTime'));
    this.maxTime = moment.duration(view.opt('maxTime'));
  },

  // Slices up a date range into a segment for each column
  rangeToSegs: function (rangeStart, rangeEnd) {
    var view = this.view;
    var segs = [];
    var seg;
    var col;
    var cellDate;
    var colStart, colEnd;

    // normalize
    rangeStart = rangeStart.clone().stripZone();
    rangeEnd = rangeEnd.clone().stripZone();

    for (col = 0; col < view.colCnt; col++) {
      cellDate = view.cellToDate(0, col); // use the View's cell system for this
      colStart = cellDate.clone().time(this.minTime);
      colEnd = cellDate.clone().time(this.maxTime);
      seg = intersectionToSeg(rangeStart, rangeEnd, colStart, colEnd);
      if (seg) {
        seg.col = col;
        segs.push(seg);
      }
    }

    return segs;
  },

  /* Coordinates
        ------------------------------------------------------------------------------------------------------------------*/

  // Called when there is a window resize/zoom and we need to recalculate coordinates for the grid
  resize: function () {
    this.computeSlatTops();
    this.updateSegVerticals();
  },

  // Populates the given empty `rows` and `cols` arrays with offset positions of the "snap" cells.
  // "Snap" cells are different the slots because they might have finer granularity.
  buildCoords: function (rows, cols) {
    var colCnt = this.view.colCnt;
    var originTop = this.el.offset().top;
    var snapTime = moment.duration(+this.minTime);
    var p = null;
    var e, n;

    this.dayEls.slice(0, colCnt).each(function (i, _e) {
      e = $(_e);
      n = e.offset().left;
      if (p) {
        p[1] = n;
      }
      p = [n];
      cols[i] = p;
    });
    p[1] = n + e.outerWidth();

    p = null;
    while (snapTime < this.maxTime) {
      n = originTop + this.computeTimeTop(snapTime);
      if (p) {
        p[1] = n;
      }
      p = [n];
      rows.push(p);
      snapTime.add(this.snapDuration);
    }
    p[1] = originTop + this.computeTimeTop(snapTime); // the position of the exclusive end
  },

  // Gets the datetime for the given slot cell
  getCellDate: function (cell) {
    var view = this.view;
    var calendar = view.calendar;

    return calendar.rezoneDate(
      // since we are adding a time, it needs to be in the calendar's timezone
      view
        .cellToDate(0, cell.col) // View's coord system only accounts for start-of-day for column
        .time(this.minTime + this.snapDuration * cell.row),
    );
  },

  // Gets the element that represents the whole-day the cell resides on
  getCellDayEl: function (cell) {
    return this.dayEls.eq(cell.col);
  },

  // Computes the top coordinate, relative to the bounds of the grid, of the given date.
  // A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
  computeDateTop: function (date, startOfDayDate) {
    return this.computeTimeTop(moment.duration(date.clone().stripZone() - startOfDayDate.clone().stripTime()));
  },

  // Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
  computeTimeTop: function (time) {
    var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered
    var slatIndex;
    var slatRemainder;
    var slatTop;
    var slatBottom;

    // constrain. because minTime/maxTime might be customized
    slatCoverage = Math.max(0, slatCoverage);
    slatCoverage = Math.min(this.slatEls.length, slatCoverage);

    slatIndex = Math.floor(slatCoverage); // an integer index of the furthest whole slot
    slatRemainder = slatCoverage - slatIndex;
    slatTop = this.slatTops[slatIndex]; // the top position of the furthest whole slot

    if (slatRemainder) {
      // time spans part-way into the slot
      slatBottom = this.slatTops[slatIndex + 1];
      return slatTop + (slatBottom - slatTop) * slatRemainder; // part-way between slots
    } else {
      return slatTop;
    }
  },

  // Queries each `slatEl` for its position relative to the grid's container and stores it in `slatTops`.
  // Includes the the bottom of the last slat as the last item in the array.
  computeSlatTops: function () {
    var tops = [];
    var top;

    this.slatEls.each(function (i, node) {
      top = $(node).position().top;
      tops.push(top);
    });

    tops.push(top + this.slatEls.last().outerHeight()); // bottom of the last slat

    this.slatTops = tops;
  },

  /* Event Drag Visualization
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being dragged over the specified date(s).
  // `end` and `seg` can be null. See View's documentation on renderDrag for more info.
  renderDrag: function (start, end, seg) {
    var opacity;

    if (seg) {
      // if there is event information for this drag, render a helper event
      this.renderRangeHelper(start, end, seg);

      opacity = this.view.opt('dragOpacity');
      if (opacity !== undefined) {
        this.helperEl.css('opacity', opacity);
      }

      return true; // signal that a helper has been rendered
    } else {
      // otherwise, just render a highlight
      this.renderHighlight(start, end || this.view.calendar.getDefaultEventEnd(false, start));
    }
  },

  // Unrenders any visual indication of an event being dragged
  destroyDrag: function () {
    this.destroyHelper();
    this.destroyHighlight();
  },

  /* Event Resize Visualization
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being resized
  renderResize: function (start, end, seg) {
    this.renderRangeHelper(start, end, seg);
  },

  // Unrenders any visual indication of an event being resized
  destroyResize: function () {
    this.destroyHelper();
  },

  /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a mock "helper" event. `sourceSeg` is the original segment object and might be null (an external drag)
  renderHelper: function (event, sourceSeg) {
    var res = this.renderEventTable([event]);
    var tableEl = res.tableEl;
    var segs = res.segs;
    var i, seg;
    var sourceEl;

    // Try to make the segment that is in the same row as sourceSeg look the same
    for (i = 0; i < segs.length; i++) {
      seg = segs[i];
      if (sourceSeg && sourceSeg.col === seg.col) {
        sourceEl = sourceSeg.el;
        seg.el.css({
          left: sourceEl.css('left'),
          right: sourceEl.css('right'),
          'margin-left': sourceEl.css('margin-left'),
          'margin-right': sourceEl.css('margin-right'),
        });
      }
    }

    this.helperEl = $('<div class="fc-helper-skeleton"/>').append(tableEl).appendTo(this.el);

    $($('.fc-helper-skeleton')).find('.fc-axis').css('width', '31px');

    this.helperEl.html(this.helperEl.html().replace('undefined', ''));
    this.helperEl.find('.removeClass').remove();
  },

  // Unrenders any mock helper event
  destroyHelper: function () {
    if (this.helperEl) {
      this.helperEl.remove();
      this.helperEl = null;
    }
  },

  /* Selection
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
  renderSelection: function (start, end) {
    if (this.view.opt('selectHelper')) {
      // this setting signals that a mock helper event should be rendered
      this.renderRangeHelper(start, end);
    } else {
      this.renderHighlight(start, end);
    }
  },

  // Unrenders any visual indication of a selection
  destroySelection: function () {
    this.destroyHelper();
    this.destroyHighlight();
  },

  /* Highlight
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders an emphasis on the given date range. `start` is inclusive. `end` is exclusive.
  renderHighlight: function (start, end) {
    this.highlightEl = $(this.highlightSkeletonHtml(start, end)).appendTo(this.el);
  },

  // Unrenders the emphasis on a date range
  destroyHighlight: function () {
    if (this.highlightEl) {
      this.highlightEl.remove();
      this.highlightEl = null;
    }
  },

  // Generates HTML for a table element with containers in each column, responsible for absolutely positioning the
  // highlight elements to cover the highlighted slots.
  highlightSkeletonHtml: function (start, end) {
    var view = this.view;
    var segs = this.rangeToSegs(start, end);
    var cellHtml = '';
    var col = 0;
    var i, seg;
    var dayDate;
    var top, bottom;

    for (i = 0; i < segs.length; i++) {
      // loop through the segments. one per column
      seg = segs[i];

      // need empty cells beforehand?
      if (col < seg.col) {
        cellHtml += '<td colspan="' + (seg.col - col) + '"/>';
        col = seg.col;
      }

      // compute vertical position
      dayDate = view.cellToDate(0, col);
      top = this.computeDateTop(seg.start, dayDate);
      bottom = this.computeDateTop(seg.end, dayDate); // the y position of the bottom edge

      // generate the cell HTML. bottom becomes negative because it needs to be a CSS value relative to the
      // bottom edge of the zero-height container.
      cellHtml +=
        '<td>' +
        '<div class="fc-highlight-container">' +
        '<div class="fc-highlight" style="top:' +
        top +
        'px;bottom:-' +
        bottom +
        'px"/>' +
        '</div>' +
        '</td>';

      col++;
    }

    // need empty cells after the last segment?
    if (col < view.colCnt) {
      cellHtml += '<td colspan="' + (view.colCnt - col) + '"/>';
    }

    cellHtml = this.bookendCells(cellHtml, 'highlight');

    return '' + '<div class="fc-highlight-skeleton">' + '<table>' + '<tr>' + cellHtml + '</tr>' + '</table>' + '</div>';
  },
});

/* Event-rendering methods for the TimeGrid class
    ----------------------------------------------------------------------------------------------------------------------*/

$.extend(TimeGrid.prototype, {
  segs: null, // segment objects rendered in the component. null of events haven't been rendered yet
  eventSkeletonEl: null, // has cells with event-containers, which contain absolutely positioned event elements

  // Renders the events onto the grid and returns an array of segments that have been rendered
  renderEvents: function (events) {
    var res = this.renderEventTable(events);

    this.eventSkeletonEl = $('<div class="fc-content-skeleton"/>').append(res.tableEl);
    this.el.append(this.eventSkeletonEl);

    this.segs = res.segs;
  },

  // Retrieves rendered segment objects
  getSegs: function () {
    return this.segs || [];
  },

  // Removes all event segment elements from the view
  destroyEvents: function () {
    if (this.eventSkeletonEl) {
      this.eventSkeletonEl.remove();
      this.eventSkeletonEl = null;
    }

    this.segs = null;
  },

  // Renders and returns the <table> portion of the event-skeleton.
  // Returns an object with properties 'tbodyEl' and 'segs'.
  renderEventTable: function (events) {
    var tableEl = $('<table><tr/></table>');
    var trEl = tableEl.find('tr');
    var segs = this.eventsToSegs(events);
    var segCols;
    var i, seg;
    var col, colSegs;
    var containerEl;

    segs = this.renderSegs(segs); // returns only the visible segs
    segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg

    this.computeSegVerticals(segs); // compute and assign top/bottom

    for (col = 0; col < segCols.length; col++) {
      // iterate each column grouping
      colSegs = segCols[col];
      placeSlotSegs(colSegs); // compute horizontal coordinates, z-index's, and reorder the array

      containerEl = $('<div class="fc-event-container"/>');

      // assign positioning CSS and insert into container
      for (i = 0; i < colSegs.length; i++) {
        seg = colSegs[i];
        seg.el.css(this.generateSegPositionCss(seg));

        // if the height is short, add a className for alternate styling
        if (seg.bottom - seg.top < 30) {
          seg.el.addClass('fc-short');
        }

        containerEl.append(seg.el);
      }

      trEl.append($('<td/>').append(containerEl));
    }

    this.bookendCells(trEl, 'eventSkeleton');

    return {
      tableEl: tableEl,
      segs: segs,
    };
  },

  // Refreshes the CSS top/bottom coordinates for each segment element. Probably after a window resize/zoom.
  updateSegVerticals: function () {
    var segs = this.segs;
    var i;

    if (segs) {
      this.computeSegVerticals(segs);

      for (i = 0; i < segs.length; i++) {
        segs[i].el.css(this.generateSegVerticalCss(segs[i]));
      }
    }
  },

  // For each segment in an array, computes and assigns its top and bottom properties
  computeSegVerticals: function (segs) {
    var i, seg;

    for (i = 0; i < segs.length; i++) {
      seg = segs[i];
      seg.top = this.computeDateTop(seg.start, seg.start);
      seg.bottom = this.computeDateTop(seg.end, seg.start);
    }
  },

  // Renders the HTML for a single event segment's default rendering
  renderSegHtml: function (seg, disableResizing) {
    var view = this.view;
    var event = seg.event;
    var isDraggable = view.isEventDraggable(event);
    var isResizable = !disableResizing && seg.isEnd && view.isEventResizable(event);
    var classes = this.getSegClasses(seg, isDraggable, isResizable);
    var skinCss = this.getEventSkinCss(event);
    var timeText;
    var fullTimeText; // more verbose time text. for the print stylesheet
    var startTimeText; // just the start time text

    classes.unshift('fc-time-grid-event');

    if (view.isMultiDayEvent(event)) {
      // if the event appears to span more than one day...
      // Don't display time text on segments that run entirely through a day.
      // That would appear as midnight-midnight and would look dumb.
      // Otherwise, display the time text for the *segment's* times (like 6pm-midnight or midnight-10am)
      if (seg.isStart || seg.isEnd) {
        timeText = view.getEventTimeText(seg.start, seg.end);
        fullTimeText = view.getEventTimeText(seg.start, seg.end, 'LT');
        startTimeText = view.getEventTimeText(seg.start, null);
      }
    } else {
      // Display the normal time text for the *event's* times
      timeText = view.getEventTimeText(event);
      fullTimeText = view.getEventTimeText(event, 'LT');
      startTimeText = view.getEventTimeText(event.start, null);
    }

    //¼æÈÝÐ¡ÓÚ30·ÖÖÓµÄÊ±ºò£¬°´30·ÖÖÓÕ¼°ë¸ñºÍÊ±¼ä·ÅÔÚ±êÌâÀïÃæ
    var timeHtml = '',
      titleH = '',
      removeClass = '';
    if (event.startTime) {
      if (moment(event.endTime) - moment(event.startTime) < 60 * 60 * 1000) {
        //Ð¡ÓÚ60·ÖÖÓ
        timeHtml = moment(event.startTime).format('HH:mm') + ' - ' + moment(event.endTime).format('HH:mm');
        removeClass = 'removeClass';
      } else timeHtml = htmlEscape(timeText);
    } else {
      timeHtml = htmlEscape(timeText);
    }

    var dataEnd = '';
    if (event.endTime) {
      dataEnd = moment(event.endTime).format('HH:mm');
    }
    return (
      '<a class="' +
      classes.join(' ') +
      ' showActiveTitle"' +
      (skinCss ? ' style="' + skinCss + '"' : '') +
      '>' +
      '<div class="fc-content">' +
      (timeText
        ? '<div class="fc-time"' +
          ' data-start="' +
          htmlEscape(startTimeText) +
          '"' +
          ' data-end="' +
          dataEnd +
          '"' +
          ' data-full="' +
          htmlEscape(fullTimeText) +
          '"' +
          '>' +
          '<span class="' +
          removeClass +
          '">' +
          timeHtml +
          '</span>' +
          '</div>'
        : '') +
      (event.title ? '<div class="fc-title">' + titleH + htmlEscape(event.title) + '</div>' : '') +
      '</div>' +
      '<div class="fc-bg"/>' +
      (isResizable ? '<div class="fc-resizer"/>' : '') +
      '</a>'
    );
  },

  // Generates an object with CSS properties/values that should be applied to an event segment element.
  // Contains important positioning-related properties that should be applied to any event element, customized or not.
  generateSegPositionCss: function (seg) {
    var view = this.view;
    var isRTL = view.opt('isRTL');
    var shouldOverlap = view.opt('slotEventOverlap');
    var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point
    var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point
    var props = this.generateSegVerticalCss(seg); // get top/bottom first
    var left; // amount of space from left edge, a fraction of the total width
    var right; // amount of space from right edge, a fraction of the total width

    if (shouldOverlap) {
      // double the width, but don't go beyond the maximum forward coordinate (1.0)
      forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);
    }

    if (isRTL) {
      left = 1 - forwardCoord;
      right = backwardCoord;
    } else {
      left = backwardCoord;
      right = 1 - forwardCoord;
    }

    props.zIndex = seg.level + 1; // convert from 0-base to 1-based
    props.left = left * 100 + '%';
    props.right = right * 100 + '%';

    if (shouldOverlap && seg.forwardPressure) {
      // add padding to the edge so that forward stacked events don't cover the resizer's icon
      props[isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width
    }

    return props;
  },

  // Generates an object with CSS properties for the top/bottom coordinates of a segment element
  generateSegVerticalCss: function (seg) {
    return {
      top: seg.top,
      bottom: -seg.bottom, // flipped because needs to be space beyond bottom edge of event container
    };
  },

  // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
  groupSegCols: function (segs) {
    var view = this.view;
    var segCols = [];
    var i;

    for (i = 0; i < view.colCnt; i++) {
      segCols.push([]);
    }

    for (i = 0; i < segs.length; i++) {
      segCols[segs[i].col].push(segs[i]);
    }

    return segCols;
  },
});

// Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
// Also reorders the given array by date!
function placeSlotSegs(segs) {
  var levels;
  var level0;
  var i;

  segs.sort(compareSegs); // order by date
  levels = buildSlotSegLevels(segs);
  computeForwardSlotSegs(levels);

  if ((level0 = levels[0])) {
    for (i = 0; i < level0.length; i++) {
      computeSlotSegPressures(level0[i]);
    }

    for (i = 0; i < level0.length; i++) {
      computeSlotSegCoords(level0[i], 0, 0);
    }
  }
}

// Builds an array of segments "levels". The first level will be the leftmost tier of segments if the calendar is
// left-to-right, or the rightmost if the calendar is right-to-left. Assumes the segments are already ordered by date.
function buildSlotSegLevels(segs) {
  var levels = [];
  var i, seg;
  var j;

  for (i = 0; i < segs.length; i++) {
    seg = segs[i];

    // go through all the levels and stop on the first level where there are no collisions
    for (j = 0; j < levels.length; j++) {
      if (!computeSlotSegCollisions(seg, levels[j]).length) {
        break;
      }
    }

    seg.level = j;

    (levels[j] || (levels[j] = [])).push(seg);
  }

  return levels;
}

// For every segment, figure out the other segments that are in subsequent
// levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
function computeForwardSlotSegs(levels) {
  var i, level;
  var j, seg;
  var k;

  for (i = 0; i < levels.length; i++) {
    level = levels[i];

    for (j = 0; j < level.length; j++) {
      seg = level[j];

      seg.forwardSegs = [];
      for (k = i + 1; k < levels.length; k++) {
        computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
      }
    }
  }
}

// Figure out which path forward (via seg.forwardSegs) results in the longest path until
// the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
function computeSlotSegPressures(seg) {
  var forwardSegs = seg.forwardSegs;
  var forwardPressure = 0;
  var i, forwardSeg;

  if (seg.forwardPressure === undefined) {
    // not already computed

    for (i = 0; i < forwardSegs.length; i++) {
      forwardSeg = forwardSegs[i];

      // figure out the child's maximum forward path
      computeSlotSegPressures(forwardSeg);

      // either use the existing maximum, or use the child's forward pressure
      // plus one (for the forwardSeg itself)
      forwardPressure = Math.max(forwardPressure, 1 + forwardSeg.forwardPressure);
    }

    seg.forwardPressure = forwardPressure;
  }
}

// Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
// from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
// seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
//
// The segment might be part of a "series", which means consecutive segments with the same pressure
// who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
// segments behind this one in the current series, and `seriesBackwardCoord` is the starting
// coordinate of the first segment in the series.
function computeSlotSegCoords(seg, seriesBackwardPressure, seriesBackwardCoord) {
  var forwardSegs = seg.forwardSegs;
  var i;

  if (seg.forwardCoord === undefined) {
    // not already computed

    if (!forwardSegs.length) {
      // if there are no forward segments, this segment should butt up against the edge
      seg.forwardCoord = 1;
    } else {
      // sort highest pressure first
      forwardSegs.sort(compareForwardSlotSegs);

      // this segment's forwardCoord will be calculated from the backwardCoord of the
      // highest-pressure forward segment.
      computeSlotSegCoords(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
      seg.forwardCoord = forwardSegs[0].backwardCoord;
    }

    // calculate the backwardCoord from the forwardCoord. consider the series
    seg.backwardCoord =
      seg.forwardCoord -
      (seg.forwardCoord - seriesBackwardCoord) / // available width for series
        (seriesBackwardPressure + 1); // # of segments in the series

    // use this segment's coordinates to computed the coordinates of the less-pressurized
    // forward segments
    for (i = 0; i < forwardSegs.length; i++) {
      computeSlotSegCoords(forwardSegs[i], 0, seg.forwardCoord);
    }
  }
}

// Find all the segments in `otherSegs` that vertically collide with `seg`.
// Append into an optionally-supplied `results` array and return.
function computeSlotSegCollisions(seg, otherSegs, results) {
  results = results || [];

  for (var i = 0; i < otherSegs.length; i++) {
    if (isSlotSegCollision(seg, otherSegs[i])) {
      results.push(otherSegs[i]);
    }
  }

  return results;
}

// Do these segments occupy the same vertical space?
function isSlotSegCollision(seg1, seg2) {
  return seg1.bottom > seg2.top && seg1.top < seg2.bottom;
}

// A cmp function for determining which forward segment to rely on more when computing coordinates.
function compareForwardSlotSegs(seg1, seg2) {
  // put higher-pressure first
  return (
    seg2.forwardPressure - seg1.forwardPressure ||
    // put segments that are closer to initial edge first (and favor ones with no coords yet)
    (seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
    // do normal sorting...
    compareSegs(seg1, seg2)
  );
}

/* An abstract class from which other views inherit from
    ----------------------------------------------------------------------------------------------------------------------*/
// Newer methods should be written as prototype methods, not in the monster `View` function at the bottom.

View.prototype = {
  calendar: null, // owner Calendar object
  coordMap: null, // a CoordMap object for converting pixel regions to dates
  el: null, // the view's containing element. set by Calendar

  // important Moments
  start: null, // the date of the very first cell
  end: null, // the date after the very last cell
  intervalStart: null, // the start of the interval of time the view represents (1st of month for month view)
  intervalEnd: null, // the exclusive end of the interval of time the view represents

  // used for cell-to-date and date-to-cell calculations
  rowCnt: null, // # of weeks
  colCnt: null, // # of days displayed in a week

  isSelected: false, // boolean whether cells are user-selected or not

  // subclasses can optionally use a scroll container
  scrollerEl: null, // the element that will most likely scroll when content is too tall
  scrollTop: null, // cached vertical scroll value

  // classNames styled by jqui themes
  widgetHeaderClass: null,
  widgetContentClass: null,
  highlightStateClass: null,

  // document handlers, bound to `this` object
  documentMousedownProxy: null,
  documentDragStartProxy: null,

  // Serves as a "constructor" to suppliment the monster `View` constructor below
  init: function () {
    var tm = this.opt('theme') ? 'ui' : 'fc';

    this.widgetHeaderClass = tm + '-widget-header';
    this.widgetContentClass = tm + '-widget-content';
    this.highlightStateClass = tm + '-state-highlight';

    // save references to `this`-bound handlers
    this.documentMousedownProxy = $.proxy(this, 'documentMousedown');
    this.documentDragStartProxy = $.proxy(this, 'documentDragStart');
  },

  // Renders the view inside an already-defined `this.el`.
  // Subclasses should override this and then call the super method afterwards.
  render: function () {
    this.updateSize();
    this.trigger('viewRender', this, this, this.el);

    // attach handlers to document. do it here to allow for destroy/rerender
    $(document).on('mousedown', this.documentMousedownProxy).on('dragstart', this.documentDragStartProxy); // jqui drag
  },

  // Clears all view rendering, event elements, and unregisters handlers
  destroy: function () {
    this.unselect();
    this.trigger('viewDestroy', this, this, this.el);
    this.destroyEvents();
    this.el.empty(); // removes inner contents but leaves the element intact

    $(document).off('mousedown', this.documentMousedownProxy).off('dragstart', this.documentDragStartProxy);
  },

  // Used to determine what happens when the users clicks next/prev. Given -1 for prev, 1 for next.
  // Should apply the delta to `date` (a Moment) and return it.
  incrementDate: function (date, delta) {
    // subclasses should implement
  },

  /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/

  // Refreshes anything dependant upon sizing of the container element of the grid
  updateSize: function (isResize) {
    if (isResize) {
      this.recordScroll();
    }
    this.updateHeight();
    this.updateWidth();
  },

  // Refreshes the horizontal dimensions of the calendar
  updateWidth: function () {
    // subclasses should implement
  },

  // Refreshes the vertical dimensions of the calendar
  updateHeight: function () {
    var calendar = this.calendar; // we poll the calendar for height information

    this.setHeight(calendar.getSuggestedViewHeight(), calendar.isHeightAuto());
  },

  // Updates the vertical dimensions of the calendar to the specified height.
  // if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
  setHeight: function (height, isAuto) {
    // subclasses should implement
  },

  // Given the total height of the view, return the number of pixels that should be used for the scroller.
  // Utility for subclasses.
  computeScrollerHeight: function (totalHeight) {
    var both = this.el.add(this.scrollerEl);
    var otherHeight; // cumulative height of everything that is not the scrollerEl in the view (header+borders)

    // fuckin IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
    both.css({
      position: 'relative', // cause a reflow, which will force fresh dimension recalculation
      left: -1, // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
    });
    otherHeight = this.el.outerHeight() - this.scrollerEl.height(); // grab the dimensions
    both.css({ position: '', left: '' }); // undo hack

    return totalHeight - otherHeight;
  },

  // Called for remembering the current scroll value of the scroller.
  // Should be called before there is a destructive operation (like removing DOM elements) that might inadvertently
  // change the scroll of the container.
  recordScroll: function () {
    if (this.scrollerEl) {
      this.scrollTop = this.scrollerEl.scrollTop();
    }
  },

  // Set the scroll value of the scroller to the previously recorded value.
  // Should be called after we know the view's dimensions have been restored following some type of destructive
  // operation (like temporarily removing DOM elements).
  restoreScroll: function () {
    if (this.scrollTop !== null) {
      this.scrollerEl.scrollTop(this.scrollTop);
    }
  },

  /* Events
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders the events onto the view.
  // Should be overriden by subclasses. Subclasses should call the super-method afterwards.
  renderEvents: function (events) {
    this.segEach(function (seg) {
      this.trigger('eventAfterRender', seg.event, seg.event, seg.el);
    });
    this.trigger('eventAfterAllRender');
  },

  // Removes event elements from the view.
  // Should be overridden by subclasses. Should call this super-method FIRST, then subclass DOM destruction.
  destroyEvents: function () {
    this.segEach(function (seg) {
      this.trigger('eventDestroy', seg.event, seg.event, seg.el);
    });
  },

  // Given an event and the default element used for rendering, returns the element that should actually be used.
  // Basically runs events and elements through the eventRender hook.
  resolveEventEl: function (event, el) {
    var custom = this.trigger('eventRender', event, event, el);

    if (custom === false) {
      // means don't render at all
      el = null;
    } else if (custom && custom !== true) {
      el = $(custom);
    }

    return el;
  },

  // Hides all rendered event segments linked to the given event
  showEvent: function (event) {
    this.segEach(function (seg) {
      seg.el.css('visibility', '');
    }, event);
  },

  // Shows all rendered event segments linked to the given event
  hideEvent: function (event) {
    this.segEach(function (seg) {
      seg.el.css('visibility', 'hidden');
    }, event);
  },

  // Iterates through event segments. Goes through all by default.
  // If the optional `event` argument is specified, only iterates through segments linked to that event.
  // The `this` value of the callback function will be the view.
  segEach: function (func, event) {
    var segs = this.getSegs();
    var i;

    for (i = 0; i < segs.length; i++) {
      if (!event || segs[i].event._id === event._id) {
        func.call(this, segs[i]);
      }
    }
  },

  // Retrieves all the rendered segment objects for the view
  getSegs: function () {
    // subclasses must implement
  },

  /* Event Drag Visualization
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event hovering over the specified date.
  // `end` is a Moment and might be null.
  // `seg` might be null. if specified, it is the segment object of the event being dragged.
  //       otherwise, an external event from outside the calendar is being dragged.
  renderDrag: function (start, end, seg) {
    // subclasses should implement
  },

  // Unrenders a visual indication of event hovering
  destroyDrag: function () {
    // subclasses should implement
  },

  // Handler for accepting externally dragged events being dropped in the view.
  // Gets called when jqui's 'dragstart' is fired.
  documentDragStart: function (ev, ui) {
    var _this = this;
    var dropDate = null;
    var dragListener;

    if (this.opt('droppable')) {
      // only listen if this setting is on

      // listener that tracks mouse movement over date-associated pixel regions
      dragListener = new DragListener(this.coordMap, {
        cellOver: function (cell, date) {
          dropDate = date;
          _this.renderDrag(date);
        },
        cellOut: function () {
          dropDate = null;
          _this.destroyDrag();
        },
      });

      // gets called, only once, when jqui drag is finished
      $(document).one('dragstop', function (ev, ui) {
        _this.destroyDrag();
        if (dropDate) {
          _this.trigger('drop', ev.target, dropDate, ev, ui);
        }
      });

      dragListener.startDrag(ev); // start listening immediately
    }
  },

  /* Selection
        ------------------------------------------------------------------------------------------------------------------*/

  // Selects a date range on the view. `start` and `end` are both Moments.
  // `ev` is the native mouse event that begin the interaction.
  select: function (start, end, ev) {
    this.unselect(ev);
    this.renderSelection(start, end);
    this.reportSelection(start, end, ev);
  },

  // Renders a visual indication of the selection
  renderSelection: function (start, end) {
    // subclasses should implement
  },

  // Called when a new selection is made. Updates internal state and triggers handlers.
  reportSelection: function (start, end, ev) {
    this.isSelected = true;
    this.trigger('select', null, start, end, ev);
  },

  // Undoes a selection. updates in the internal state and triggers handlers.
  // `ev` is the native mouse event that began the interaction.
  unselect: function (ev) {
    if (this.isSelected) {
      this.isSelected = false;
      this.destroySelection();
      this.trigger('unselect', null, ev);
    }
  },

  // Unrenders a visual indication of selection
  destroySelection: function () {
    // subclasses should implement
  },

  // Handler for unselecting when the user clicks something and the 'unselectAuto' setting is on
  documentMousedown: function (ev) {
    var ignore;

    // is there a selection, and has the user made a proper left click?
    if (this.isSelected && this.opt('unselectAuto') && isPrimaryMouseButton(ev)) {
      // only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
      ignore = this.opt('unselectCancel');
      if (!ignore || !$(ev.target).closest(ignore).length) {
        this.unselect(ev);
      }
    }
  },
};

// We are mixing JavaScript OOP design patterns here by putting methods and member variables in the closed scope of the
// constructor. Going forward, methods should be part of the prototype.
function View(calendar) {
  var t = this;

  // exports
  t.calendar = calendar;
  t.opt = opt;
  t.trigger = trigger;
  t.isEventDraggable = isEventDraggable;
  t.isEventResizable = isEventResizable;
  t.eventDrop = eventDrop;
  t.eventResize = eventResize;

  // imports
  var reportEventChange = calendar.reportEventChange;

  // locals
  var options = calendar.options;
  var nextDayThreshold = moment.duration(options.nextDayThreshold);

  t.init(); // the "constructor" that concerns the prototype methods

  function opt(name) {
    var v = options[name];
    if ($.isPlainObject(v) && !isForcedAtomicOption(name)) {
      return smartProperty(v, t.name);
    }
    return v;
  }

  function trigger(name, thisObj) {
    return calendar.trigger.apply(calendar, [name, thisObj || t].concat(Array.prototype.slice.call(arguments, 2), [t]));
  }

  /* Event Editable Boolean Calculations
        ------------------------------------------------------------------------------*/

  function isEventDraggable(event) {
    var source = event.source || {};

    return firstDefined(
      event.startEditable,
      source.startEditable,
      opt('eventStartEditable'),
      event.editable,
      source.editable,
      opt('editable'),
    );
  }

  function isEventResizable(event) {
    var source = event.source || {};

    return firstDefined(
      event.durationEditable,
      source.durationEditable,
      opt('eventDurationEditable'),
      event.editable,
      source.editable,
      opt('editable'),
    );
  }

  /* Event Elements
        ------------------------------------------------------------------------------*/

  // Compute the text that should be displayed on an event's element.
  // Based off the settings of the view. Possible signatures:
  //   .getEventTimeText(event, formatStr)
  //   .getEventTimeText(startMoment, endMoment, formatStr)
  //   .getEventTimeText(startMoment, null, formatStr)
  // `timeFormat` is used but the `formatStr` argument can be used to override.
  t.getEventTimeText = function (event, formatStr) {
    var start;
    var end;

    if (typeof event === 'object' && typeof formatStr === 'object') {
      // first two arguments are actually moments (or null). shift arguments.
      start = event;
      end = formatStr;
      formatStr = arguments[2];
    } else {
      // otherwise, an event object was the first argument
      start = event.start;
      end = event.end;
    }

    formatStr = formatStr || opt('timeFormat');

    if (end && opt('displayEventEnd')) {
      return calendar.formatRange(start, end, formatStr);
    } else {
      return calendar.formatDate(start, formatStr);
    }
  };

  /* Event Modification Reporting
        ---------------------------------------------------------------------------------*/

  function eventDrop(el, event, newStart, ev) {
    var mutateResult = calendar.mutateEvent(event, newStart, null);

    trigger(
      'eventDrop',
      el,
      event,
      mutateResult.dateDelta,
      function () {
        mutateResult.undo();
        reportEventChange();
      },
      ev,
      {}, // jqui dummy
    );

    reportEventChange();
  }

  function eventResize(el, event, newEnd, ev) {
    var mutateResult = calendar.mutateEvent(event, null, newEnd);

    trigger(
      'eventResize',
      el,
      event,
      mutateResult.durationDelta,
      function () {
        mutateResult.undo();
        reportEventChange();
      },
      ev,
      {}, // jqui dummy
    );

    reportEventChange();
  }

  // ====================================================================================================
  // Utilities for day "cells"
  // ====================================================================================================
  // The "basic" views are completely made up of day cells.
  // The "agenda" views have day cells at the top "all day" slot.
  // This was the obvious common place to put these utilities, but they should be abstracted out into
  // a more meaningful class (like DayEventRenderer).
  // ====================================================================================================

  // For determining how a given "cell" translates into a "date":
  //
  // 1. Convert the "cell" (row and column) into a "cell offset" (the # of the cell, cronologically from the first).
  //    Keep in mind that column indices are inverted with isRTL. This is taken into account.
  //
  // 2. Convert the "cell offset" to a "day offset" (the # of days since the first visible day in the view).
  //
  // 3. Convert the "day offset" into a "date" (a Moment).
  //
  // The reverse transformation happens when transforming a date into a cell.

  // exports
  t.isHiddenDay = isHiddenDay;
  t.skipHiddenDays = skipHiddenDays;
  t.getCellsPerWeek = getCellsPerWeek;
  t.dateToCell = dateToCell;
  t.dateToDayOffset = dateToDayOffset;
  t.dayOffsetToCellOffset = dayOffsetToCellOffset;
  t.cellOffsetToCell = cellOffsetToCell;
  t.cellToDate = cellToDate;
  t.cellToCellOffset = cellToCellOffset;
  t.cellOffsetToDayOffset = cellOffsetToDayOffset;
  t.dayOffsetToDate = dayOffsetToDate;
  t.rangeToSegments = rangeToSegments;
  t.isMultiDayEvent = isMultiDayEvent;

  // internals
  var hiddenDays = opt('hiddenDays') || []; // array of day-of-week indices that are hidden
  var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)
  var cellsPerWeek;
  var dayToCellMap = []; // hash from dayIndex -> cellIndex, for one week
  var cellToDayMap = []; // hash from cellIndex -> dayIndex, for one week
  var isRTL = opt('isRTL');

  // initialize important internal variables
  (function () {
    if (opt('weekends') === false) {
      hiddenDays.push(0, 6); // 0=sunday, 6=saturday
    }

    // Loop through a hypothetical week and determine which
    // days-of-week are hidden. Record in both hashes (one is the reverse of the other).
    for (var dayIndex = 0, cellIndex = 0; dayIndex < 7; dayIndex++) {
      dayToCellMap[dayIndex] = cellIndex;
      isHiddenDayHash[dayIndex] = $.inArray(dayIndex, hiddenDays) != -1;
      if (!isHiddenDayHash[dayIndex]) {
        cellToDayMap[cellIndex] = dayIndex;
        cellIndex++;
      }
    }

    cellsPerWeek = cellIndex;
    if (!cellsPerWeek) {
      throw 'invalid hiddenDays'; // all days were hidden? bad.
    }
  })();

  // Is the current day hidden?
  // `day` is a day-of-week index (0-6), or a Moment
  function isHiddenDay(day) {
    if (moment.isMoment(day)) {
      day = day.day();
    }
    return isHiddenDayHash[day];
  }

  function getCellsPerWeek() {
    return cellsPerWeek;
  }

  // Incrementing the current day until it is no longer a hidden day, returning a copy.
  // If the initial value of `date` is not a hidden day, don't do anything.
  // Pass `isExclusive` as `true` if you are dealing with an end date.
  // `inc` defaults to `1` (increment one day forward each time)
  function skipHiddenDays(date, inc, isExclusive) {
    var out = date.clone();
    inc = inc || 1;
    while (isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]) {
      out.add(inc, 'days');
    }
    return out;
  }

  //
  // TRANSFORMATIONS: cell -> cell offset -> day offset -> date
  //

  // cell -> date (combines all transformations)
  // Possible arguments:
  // - row, col
  // - { row:#, col: # }
  function cellToDate() {
    var cellOffset = cellToCellOffset.apply(null, arguments);
    var dayOffset = cellOffsetToDayOffset(cellOffset);
    var date = dayOffsetToDate(dayOffset);
    return date;
  }

  // cell -> cell offset
  // Possible arguments:
  // - row, col
  // - { row:#, col:# }
  function cellToCellOffset(row, col) {
    var colCnt = t.colCnt;

    // rtl variables. wish we could pre-populate these. but where?
    var dis = isRTL ? -1 : 1;
    var dit = isRTL ? colCnt - 1 : 0;

    if (typeof row == 'object') {
      col = row.col;
      row = row.row;
    }
    var cellOffset = row * colCnt + (col * dis + dit); // column, adjusted for RTL (dis & dit)

    return cellOffset;
  }

  // cell offset -> day offset
  function cellOffsetToDayOffset(cellOffset) {
    var day0 = t.start.day(); // first date's day of week
    cellOffset += dayToCellMap[day0]; // normlize cellOffset to beginning-of-week
    return (
      Math.floor(cellOffset / cellsPerWeek) * 7 + // # of days from full weeks
      cellToDayMap[ // # of days from partial last week
        ((cellOffset % cellsPerWeek) + cellsPerWeek) % cellsPerWeek // crazy math to handle negative cellOffsets
      ] -
      day0
    ); // adjustment for beginning-of-week normalization
  }

  // day offset -> date
  function dayOffsetToDate(dayOffset) {
    return t.start.clone().add(dayOffset, 'days');
  }

  //
  // TRANSFORMATIONS: date -> day offset -> cell offset -> cell
  //

  // date -> cell (combines all transformations)
  function dateToCell(date) {
    var dayOffset = dateToDayOffset(date);
    var cellOffset = dayOffsetToCellOffset(dayOffset);
    var cell = cellOffsetToCell(cellOffset);
    return cell;
  }

  // date -> day offset
  function dateToDayOffset(date) {
    return date.clone().stripTime().diff(t.start, 'days');
  }

  // day offset -> cell offset
  function dayOffsetToCellOffset(dayOffset) {
    var day0 = t.start.day(); // first date's day of week
    dayOffset += day0; // normalize dayOffset to beginning-of-week
    return (
      Math.floor(dayOffset / 7) * cellsPerWeek + // # of cells from full weeks
      dayToCellMap[ // # of cells from partial last week
        ((dayOffset % 7) + 7) % 7 // crazy math to handle negative dayOffsets
      ] -
      dayToCellMap[day0]
    ); // adjustment for beginning-of-week normalization
  }

  // cell offset -> cell (object with row & col keys)
  function cellOffsetToCell(cellOffset) {
    var colCnt = t.colCnt;

    // rtl variables. wish we could pre-populate these. but where?
    var dis = isRTL ? -1 : 1;
    var dit = isRTL ? colCnt - 1 : 0;

    var row = Math.floor(cellOffset / colCnt);
    var col = (((cellOffset % colCnt) + colCnt) % colCnt) * dis + dit; // column, adjusted for RTL (dis & dit)
    return {
      row: row,
      col: col,
    };
  }

  //
  // Converts a date range into an array of segment objects.
  // "Segments" are horizontal stretches of time, sliced up by row.
  // A segment object has the following properties:
  // - row
  // - cols
  // - isStart
  // - isEnd
  //
  function rangeToSegments(start, end) {
    var rowCnt = t.rowCnt;
    var colCnt = t.colCnt;
    var segments = []; // array of segments to return

    // day offset for given date range
    var dayRange = computeDayRange(start, end); // convert to a whole-day range
    var rangeDayOffsetStart = dateToDayOffset(dayRange.start);
    var rangeDayOffsetEnd = dateToDayOffset(dayRange.end); // an exclusive value

    // first and last cell offset for the given date range
    // "last" implies inclusivity
    var rangeCellOffsetFirst = dayOffsetToCellOffset(rangeDayOffsetStart);
    var rangeCellOffsetLast = dayOffsetToCellOffset(rangeDayOffsetEnd) - 1;

    // loop through all the rows in the view
    for (var row = 0; row < rowCnt; row++) {
      // first and last cell offset for the row
      var rowCellOffsetFirst = row * colCnt;
      var rowCellOffsetLast = rowCellOffsetFirst + colCnt - 1;

      // get the segment's cell offsets by constraining the range's cell offsets to the bounds of the row
      var segmentCellOffsetFirst = Math.max(rangeCellOffsetFirst, rowCellOffsetFirst);
      var segmentCellOffsetLast = Math.min(rangeCellOffsetLast, rowCellOffsetLast);

      // make sure segment's offsets are valid and in view
      if (segmentCellOffsetFirst <= segmentCellOffsetLast) {
        // translate to cells
        var segmentCellFirst = cellOffsetToCell(segmentCellOffsetFirst);
        var segmentCellLast = cellOffsetToCell(segmentCellOffsetLast);

        // view might be RTL, so order by leftmost column
        var cols = [segmentCellFirst.col, segmentCellLast.col].sort();

        // Determine if segment's first/last cell is the beginning/end of the date range.
        // We need to compare "day offset" because "cell offsets" are often ambiguous and
        // can translate to multiple days, and an edge case reveals itself when we the
        // range's first cell is hidden (we don't want isStart to be true).
        var isStart = cellOffsetToDayOffset(segmentCellOffsetFirst) == rangeDayOffsetStart;
        var isEnd = cellOffsetToDayOffset(segmentCellOffsetLast) + 1 == rangeDayOffsetEnd;
        // +1 for comparing exclusively

        segments.push({
          row: row,
          leftCol: cols[0],
          rightCol: cols[1],
          isStart: isStart,
          isEnd: isEnd,
        });
      }
    }

    return segments;
  }

  // Returns the date range of the full days the given range visually appears to occupy.
  // Returns object with properties `start` (moment) and `end` (moment, exclusive end).
  function computeDayRange(start, end) {
    var startDay = start.clone().stripTime(); // the beginning of the day the range starts
    var endDay;
    var endTimeMS;

    if (end) {
      endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
      endTimeMS = +end.time(); // # of milliseconds into `endDay`

      // If the end time is actually inclusively part of the next day and is equal to or
      // beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.
      // Otherwise, leaving it as inclusive will cause it to exclude `endDay`.
      if (endTimeMS && endTimeMS >= nextDayThreshold) {
        endDay.add(1, 'days');
      }
    }

    // If no end was specified, or if it is within `startDay` but not past nextDayThreshold,
    // assign the default duration of one day.
    if (!end || endDay <= startDay) {
      endDay = startDay.clone().add(1, 'days');
    }

    return { start: startDay, end: endDay };
  }

  // Does the given event visually appear to occupy more than one day?
  function isMultiDayEvent(event) {
    var range = computeDayRange(event.start, event.end);

    return range.end.diff(range.start, 'days') > 1;
  }
}

/* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
    ----------------------------------------------------------------------------------------------------------------------*/
// It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
// It is responsible for managing width/height.

function BasicView(calendar) {
  View.call(this, calendar); // call the super-constructor
  this.dayGrid = new DayGrid(this);
  this.coordMap = this.dayGrid.coordMap; // the view's date-to-cell mapping is identical to the subcomponent's
}

BasicView.prototype = createObject(View.prototype); // define the super-class
$.extend(BasicView.prototype, {
  dayGrid: null, // the main subcomponent that does most of the heavy lifting

  dayNumbersVisible: false, // display day numbers on each day cell?
  weekNumbersVisible: false, // display week numbers along the side?

  weekNumberWidth: null, // width of all the week-number cells running down the side

  headRowEl: null, // the fake row element of the day-of-week header

  // Renders the view into `this.el`, which should already be assigned.
  // rowCnt, colCnt, and dayNumbersVisible have been calculated by a subclass and passed here.
  render: function (rowCnt, colCnt, dayNumbersVisible) {
    // needed for cell-to-date and date-to-cell calculations in View
    this.rowCnt = rowCnt;
    this.colCnt = colCnt;

    this.dayNumbersVisible = dayNumbersVisible;
    this.weekNumbersVisible = this.opt('weekNumbers');
    this.dayGrid.numbersVisible = this.dayNumbersVisible || this.weekNumbersVisible;

    this.el.addClass('fc-basic-view').html(this.renderHtml());

    this.headRowEl = this.el.find('thead .fc-row');

    this.scrollerEl = this.el.find('.fc-day-grid-container');
    this.dayGrid.coordMap.containerEl = this.scrollerEl; // constrain clicks/etc to the dimensions of the scroller

    this.dayGrid.el = this.el.find('.fc-day-grid');
    this.dayGrid.render(this.hasRigidRows());

    View.prototype.render.call(this); // call the super-method
  },

  // Make subcomponents ready for cleanup
  destroy: function () {
    this.dayGrid.destroy();
    View.prototype.destroy.call(this); // call the super-method
  },

  // Builds the HTML skeleton for the view.
  // The day-grid component will render inside of a container defined by this HTML.
  renderHtml: function () {
    return (
      '' +
      '<table>' +
      '<thead>' +
      '<tr>' +
      '<td class="' +
      this.widgetHeaderClass +
      '">' +
      this.dayGrid.headHtml() + // render the day-of-week headers
      '</td>' +
      '</tr>' +
      '</thead>' +
      '<tbody>' +
      '<tr>' +
      '<td class="' +
      this.widgetContentClass +
      '">' +
      '<div class="fc-day-grid-container">' +
      '<div class="fc-day-grid"/>' +
      '</div>' +
      '</td>' +
      '</tr>' +
      '</tbody>' +
      '</table>'
    );
  },

  // Generates the HTML that will go before the day-of week header cells.
  // Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
  headIntroHtml: function () {
    if (this.weekNumbersVisible) {
      return (
        '' +
        '<th class="fc-week-number ' +
        this.widgetHeaderClass +
        '" ' +
        this.weekNumberStyleAttr() +
        '>' +
        '<span>' + // needed for matchCellWidths
        htmlEscape(this.opt('weekNumberTitle')) +
        '</span>' +
        '</th>'
      );
    }
  },

  // Generates the HTML that will go before content-skeleton cells that display the day/week numbers.
  // Queried by the DayGrid subcomponent. Ordering depends on isRTL.
  numberIntroHtml: function (row) {
    if (this.weekNumbersVisible) {
      return (
        '' +
        '<td class="fc-week-number" ' +
        this.weekNumberStyleAttr() +
        '>' +
        '<span>' + // needed for matchCellWidths
        this.calendar.calculateWeekNumber(this.cellToDate(row, 0)) +
        '</span>' +
        '</td>'
      );
    }
  },

  // Generates the HTML that goes before the day bg cells for each day-row.
  // Queried by the DayGrid subcomponent. Ordering depends on isRTL.
  dayIntroHtml: function () {
    if (this.weekNumbersVisible) {
      return '<td class="fc-week-number ' + this.widgetContentClass + '" ' + this.weekNumberStyleAttr() + '></td>';
    }
  },

  // Generates the HTML that goes before every other type of row generated by DayGrid. Ordering depends on isRTL.
  // Affects helper-skeleton and highlight-skeleton rows.
  introHtml: function () {
    if (this.weekNumbersVisible) {
      return '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '></td>';
    }
  },

  // Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
  // The number row will only exist if either day numbers or week numbers are turned on.
  numberCellHtml: function (row, col, date) {
    var classes;

    if (!this.dayNumbersVisible) {
      // if there are week numbers but not day numbers
      return '<td/>'; //  will create an empty space above events :(
    }

    classes = this.dayGrid.getDayClasses(date);
    classes.unshift('fc-day-number');

    return '' + '<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">' + date.date() + '</td>';
  },

  // Generates an HTML attribute string for setting the width of the week number column, if it is known
  weekNumberStyleAttr: function () {
    if (this.weekNumberWidth !== null) {
      return 'style="width:' + this.weekNumberWidth + 'px"';
    }
    return '';
  },

  // Determines whether each row should have a constant height
  hasRigidRows: function () {
    var eventLimit = this.opt('eventLimit');
    return eventLimit && typeof eventLimit !== 'number';
  },

  /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/

  // Refreshes the horizontal dimensions of the view
  updateWidth: function () {
    if (this.weekNumbersVisible) {
      // Make sure all week number cells running down the side have the same width.
      // Record the width for cells created later.
      this.weekNumberWidth = matchCellWidths(this.el.find('.fc-week-number'));
    }
  },

  // Adjusts the vertical dimensions of the view to the specified values
  setHeight: function (totalHeight, isAuto) {
    var eventLimit = this.opt('eventLimit');
    var scrollerHeight;

    // reset all heights to be natural
    unsetScroller(this.scrollerEl);
    uncompensateScroll(this.headRowEl);

    this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

    // is the event limit a constant level number?
    if (eventLimit && typeof eventLimit === 'number') {
      this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
    }

    scrollerHeight = this.computeScrollerHeight(totalHeight);
    this.setGridHeight(scrollerHeight, isAuto);

    // is the event limit dynamically calculated?
    if (eventLimit && typeof eventLimit !== 'number') {
      this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
    }

    if (!isAuto && setPotentialScroller(this.scrollerEl, scrollerHeight)) {
      // using scrollbars?

      compensateScroll(this.headRowEl, getScrollbarWidths(this.scrollerEl));

      // doing the scrollbar compensation might have created text overflow which created more height. redo
      scrollerHeight = this.computeScrollerHeight(totalHeight);
      this.scrollerEl.height(scrollerHeight);

      this.restoreScroll();
    }
  },

  // Sets the height of just the DayGrid component in this view
  setGridHeight: function (height, isAuto) {
    if (isAuto) {
      undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
    } else {
      distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
    }
  },

  /* Events
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders the given events onto the view and populates the segments array
  renderEvents: function (events) {
    this.dayGrid.renderEvents(events);

    this.updateHeight(); // must compensate for events that overflow the row

    View.prototype.renderEvents.call(this, events); // call the super-method
  },

  // Retrieves all segment objects that are rendered in the view
  getSegs: function () {
    return this.dayGrid.getSegs();
  },

  // Unrenders all event elements and clears internal segment data
  destroyEvents: function () {
    View.prototype.destroyEvents.call(this); // do this before dayGrid's segs have been cleared

    this.recordScroll(); // removing events will reduce height and mess with the scroll, so record beforehand
    this.dayGrid.destroyEvents();

    // we DON'T need to call updateHeight() because:
    // A) a renderEvents() call always happens after this, which will eventually call updateHeight()
    // B) in IE8, this causes a flash whenever events are rerendered
  },

  /* Event Dragging
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being dragged over the view.
  // A returned value of `true` signals that a mock "helper" event has been rendered.
  renderDrag: function (start, end, seg) {
    return this.dayGrid.renderDrag(start, end, seg);
  },

  // Unrenders the visual indication of an event being dragged over the view
  destroyDrag: function () {
    this.dayGrid.destroyDrag();
  },

  /* Selection
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of a selection
  renderSelection: function (start, end) {
    this.dayGrid.renderSelection(start, end);
  },

  // Unrenders a visual indications of a selection
  destroySelection: function () {
    this.dayGrid.destroySelection();
  },
});

/* A month view with day cells running in rows (one-per-week) and columns
    ----------------------------------------------------------------------------------------------------------------------*/

setDefaults({
  fixedWeekCount: true,
});

fcViews.month = MonthView; // register the view

function MonthView(calendar) {
  BasicView.call(this, calendar); // call the super-constructor
}

MonthView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(MonthView.prototype, {
  name: 'month',

  incrementDate: function (date, delta) {
    return date.clone().stripTime().add(delta, 'months').startOf('month');
  },

  render: function (date) {
    var rowCnt;

    this.intervalStart = date.clone().stripTime().startOf('month');
    this.intervalEnd = this.intervalStart.clone().add(1, 'months');

    this.start = this.intervalStart.clone();
    this.start = this.skipHiddenDays(this.start); // move past the first week if no visible days
    this.start.startOf('week');
    this.start = this.skipHiddenDays(this.start); // move past the first invisible days of the week

    this.end = this.intervalEnd.clone();
    this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last week if no visible days
    this.end.add((7 - this.end.weekday()) % 7, 'days'); // move to end of week if not already
    this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last invisible days of the week

    rowCnt = Math.ceil(
      // need to ceil in case there are hidden days
      this.end.diff(this.start, 'weeks', true), // returnfloat=true
    );
    if (this.isFixedWeeks()) {
      this.end.add(6 - rowCnt, 'weeks');
      rowCnt = 6;
    }

    this.title = this.calendar.formatDate(this.intervalStart, this.opt('titleFormat'));

    BasicView.prototype.render.call(this, rowCnt, this.getCellsPerWeek(), true); // call the super-method
  },

  // Overrides the default BasicView behavior to have special multi-week auto-height logic
  setGridHeight: function (height, isAuto) {
    isAuto = isAuto || this.opt('weekMode') === 'variable'; // LEGACY: weekMode is deprecated

    // if auto, make the height of each row the height that it would be if there were 6 weeks
    if (isAuto) {
      height *= this.rowCnt / 6;
    }

    distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
  },

  isFixedWeeks: function () {
    var weekMode = this.opt('weekMode'); // LEGACY: weekMode is deprecated
    if (weekMode) {
      return weekMode === 'fixed'; // if any other type of weekMode, assume NOT fixed
    }

    return this.opt('fixedWeekCount');
  },
});

/* A week view with simple day cells running horizontally
    ----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.basicWeek = BasicWeekView; // register this view

function BasicWeekView(calendar) {
  BasicView.call(this, calendar); // call the super-constructor
}

BasicWeekView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicWeekView.prototype, {
  name: 'basicWeek',

  incrementDate: function (date, delta) {
    return date.clone().stripTime().add(delta, 'weeks').startOf('week');
  },

  render: function (date) {
    this.intervalStart = date.clone().stripTime().startOf('week');
    this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

    this.start = this.skipHiddenDays(this.intervalStart);
    this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

    this.title = this.calendar.formatRange(
      this.start,
      this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
      this.opt('titleFormat'),
      ' \u2014 ', // emphasized dash
    );

    BasicView.prototype.render.call(this, 1, this.getCellsPerWeek(), false); // call the super-method
  },
});
/* A view with a single simple day cell
    ----------------------------------------------------------------------------------------------------------------------*/

fcViews.basicDay = BasicDayView; // register this view

function BasicDayView(calendar) {
  BasicView.call(this, calendar); // call the super-constructor
}

BasicDayView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicDayView.prototype, {
  name: 'basicDay',

  incrementDate: function (date, delta) {
    var out = date.clone().stripTime().add(delta, 'days');
    out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
    return out;
  },

  render: function (date) {
    this.start = this.intervalStart = date.clone().stripTime();
    this.end = this.intervalEnd = this.start.clone().add(1, 'days');

    this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

    BasicView.prototype.render.call(this, 1, 1, false); // call the super-method
  },
});
/* An abstract class for all agenda-related views. Displays one more columns with time slots running vertically.
    ----------------------------------------------------------------------------------------------------------------------*/
// Is a manager for the TimeGrid subcomponent and possibly the DayGrid subcomponent (if allDaySlot is on).
// Responsible for managing width/height.

setDefaults({
  allDaySlot: true,
  allDayText: 'all-day',

  scrollTime: '06:00:00',

  slotDuration: '00:30:00',

  axisFormat: generateAgendaAxisFormat,
  timeFormat: {
    agenda: generateAgendaTimeFormat,
  },

  minTime: '00:00:00',
  maxTime: '24:00:00',
  slotEventOverlap: true,
});

var AGENDA_ALL_DAY_EVENT_LIMIT = 5;

function generateAgendaAxisFormat(options, langData) {
  return langData
    .longDateFormat('LT')
    .replace(':mm', '(:mm)')
    .replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs
    .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
}

function generateAgendaTimeFormat(options, langData) {
  return langData.longDateFormat('LT').replace(/\s*a$/i, ''); // remove trailing AM/PM
}

function AgendaView(calendar) {
  View.call(this, calendar); // call the super-constructor

  this.timeGrid = new TimeGrid(this);

  if (this.opt('allDaySlot')) {
    // should we display the "all-day" area?
    this.dayGrid = new DayGrid(this); // the all-day subcomponent of this view

    // the coordinate grid will be a combination of both subcomponents' grids
    this.coordMap = new ComboCoordMap([this.dayGrid.coordMap, this.timeGrid.coordMap]);
  } else {
    this.coordMap = this.timeGrid.coordMap;
  }
}

AgendaView.prototype = createObject(View.prototype); // define the super-class
$.extend(AgendaView.prototype, {
  timeGrid: null, // the main time-grid subcomponent of this view
  dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null

  axisWidth: null, // the width of the time axis running down the side

  noScrollRowEls: null, // set of fake row elements that must compensate when scrollerEl has scrollbars

  // when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
  bottomRuleEl: null,
  bottomRuleHeight: null,

  /* Rendering
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders the view into `this.el`, which has already been assigned.
  // `colCnt` has been calculated by a subclass and passed here.
  render: function (colCnt) {
    // needed for cell-to-date and date-to-cell calculations in View
    this.rowCnt = 1;
    this.colCnt = colCnt;

    this.el.addClass('fc-agenda-view').html(this.renderHtml());

    // the element that wraps the time-grid that will probably scroll
    this.scrollerEl = this.el.find('.fc-time-grid-container');
    this.timeGrid.coordMap.containerEl = this.scrollerEl; // don't accept clicks/etc outside of this

    this.timeGrid.el = this.el.find('.fc-time-grid');
    this.timeGrid.render();

    // the <hr> that sometimes displays under the time-grid
    this.bottomRuleEl = $('<hr class="' + this.widgetHeaderClass + '"/>').appendTo(this.timeGrid.el); // inject it into the time-grid

    if (this.dayGrid) {
      this.dayGrid.el = this.el.find('.fc-day-grid');
      this.dayGrid.render();

      // have the day-grid extend it's coordinate area over the <hr> dividing the two grids
      this.dayGrid.bottomCoordPadding = this.dayGrid.el.next('hr').outerHeight();
    }

    this.noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)'); // fake rows not within the scroller

    View.prototype.render.call(this); // call the super-method

    this.resetScroll(); // do this after sizes have been set
  },

  // Make subcomponents ready for cleanup
  destroy: function () {
    this.timeGrid.destroy();
    if (this.dayGrid) {
      this.dayGrid.destroy();
    }
    View.prototype.destroy.call(this); // call the super-method
  },

  // Builds the HTML skeleton for the view.
  // The day-grid and time-grid components will render inside containers defined by this HTML.
  renderHtml: function () {
    return (
      '' +
      '<table>' +
      '<thead>' +
      '<tr>' +
      '<td class="' +
      this.widgetHeaderClass +
      '">' +
      this.timeGrid.headHtml() + // render the day-of-week headers
      '</td>' +
      '</tr>' +
      '</thead>' +
      '<tbody>' +
      '<tr>' +
      '<td class="' +
      this.widgetContentClass +
      '">' +
      (this.dayGrid ? '<div class="fc-day-grid"/>' + '<hr class="' + this.widgetHeaderClass + '"/>' : '') +
      '<div class="fc-time-grid-container">' +
      '<div class="fc-time-grid"/>' +
      '</div>' +
      '</td>' +
      '</tr>' +
      '</tbody>' +
      '</table>'
    );
  },

  // Generates the HTML that will go before the day-of week header cells.
  // Queried by the TimeGrid subcomponent when generating rows. Ordering depends on isRTL.
  headIntroHtml: function () {
    var date;
    var weekNumber;
    var weekTitle;
    var weekText;

    if (this.opt('weekNumbers')) {
      date = this.cellToDate(0, 0);
      weekNumber = this.calendar.calculateWeekNumber(date);
      weekTitle = this.opt('weekNumberTitle');

      if (this.opt('isRTL')) {
        weekText = weekNumber + weekTitle;
      } else {
        weekText = weekTitle + weekNumber;
      }

      return (
        '' +
        '<th class="fc-axis fc-week-number ' +
        this.widgetHeaderClass +
        '" ' +
        this.axisStyleAttr() +
        '>' +
        '<span>' + // needed for matchCellWidths
        htmlEscape(weekText) +
        '</span>' +
        '</th>'
      );
    } else {
      return '<th class="fc-axis ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '></th>';
    }
  },

  // Generates the HTML that goes before the all-day cells.
  // Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
  dayIntroHtml: function () {
    return (
      '' +
      '<td class="fc-axis ' +
      this.widgetContentClass +
      '" ' +
      this.axisStyleAttr() +
      '>' +
      '<span>' + // needed for matchCellWidths
      (this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'))) +
      '</span>' +
      '</td>'
    );
  },

  // Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
  slotBgIntroHtml: function () {
    return '<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '></td>';
  },

  // Generates the HTML that goes before all other types of cells.
  // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
  // Queried by the TimeGrid and DayGrid subcomponents when generating rows. Ordering depends on isRTL.
  introHtml: function () {
    return '<td class="fc-axis" ' + this.axisStyleAttr() + '></td>';
  },

  // Generates an HTML attribute string for setting the width of the axis, if it is known
  axisStyleAttr: function () {
    if (this.axisWidth !== null) {
      return 'style="width:' + this.axisWidth + 'px"';
    }
    return '';
  },

  /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/

  updateSize: function (isResize) {
    if (isResize) {
      this.timeGrid.resize();
    }
    View.prototype.updateSize.call(this, isResize);
  },

  // Refreshes the horizontal dimensions of the view
  updateWidth: function () {
    // make all axis cells line up, and record the width so newly created axis cells will have it
    this.axisWidth = matchCellWidths(this.el.find('.fc-axis'));
  },

  // Adjusts the vertical dimensions of the view to the specified values
  setHeight: function (totalHeight, isAuto) {
    var eventLimit;
    var scrollerHeight;

    if (this.bottomRuleHeight === null) {
      // calculate the height of the rule the very first time
      this.bottomRuleHeight = this.bottomRuleEl.outerHeight();
    }
    this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary

    // reset all dimensions back to the original state
    this.scrollerEl.css('overflow', '');
    unsetScroller(this.scrollerEl);
    uncompensateScroll(this.noScrollRowEls);

    // limit number of events in the all-day area
    if (this.dayGrid) {
      this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

      eventLimit = this.opt('eventLimit');
      if (eventLimit && typeof eventLimit !== 'number') {
        eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
      }
      if (eventLimit) {
        this.dayGrid.limitRows(eventLimit);
      }
    }

    if (!isAuto) {
      // should we force dimensions of the scroll container, or let the contents be natural height?

      scrollerHeight = this.computeScrollerHeight(totalHeight);
      if (setPotentialScroller(this.scrollerEl, scrollerHeight)) {
        // using scrollbars?

        // make the all-day and header rows lines up
        compensateScroll(this.noScrollRowEls, getScrollbarWidths(this.scrollerEl));

        // the scrollbar compensation might have changed text flow, which might affect height, so recalculate
        // and reapply the desired height to the scroller.
        scrollerHeight = this.computeScrollerHeight(totalHeight);
        this.scrollerEl.height(scrollerHeight);

        this.restoreScroll();
      } else {
        // no scrollbars
        // still, force a height and display the bottom rule (marks the end of day)
        this.scrollerEl.height(scrollerHeight).css('overflow', 'hidden'); // in case <hr> goes outside
        this.bottomRuleEl.show();
      }
    }
  },

  // Sets the scroll value of the scroller to the intial pre-configured state prior to allowing the user to change it.
  resetScroll: function () {
    var _this = this;
    var scrollTime = moment.duration(this.opt('scrollTime'));
    var top = this.timeGrid.computeTimeTop(scrollTime);

    // zoom can give weird floating-point values. rather scroll a little bit further
    top = Math.ceil(top);

    if (top) {
      top++; // to overcome top border that slots beyond the first have. looks better
    }

    function scroll() {
      _this.scrollerEl.scrollTop(top);
    }

    scroll();
    setTimeout(scroll, 0); // overrides any previous scroll state made by the browser
  },

  /* Events
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders events onto the view and populates the View's segment array
  renderEvents: function (events) {
    var dayEvents = [];
    var timedEvents = [];
    var daySegs = [];
    var timedSegs;
    var i;

    // separate the events into all-day and timed
    for (i = 0; i < events.length; i++) {
      if (events[i].allDay) {
        dayEvents.push(events[i]);
      } else {
        timedEvents.push(events[i]);
      }
    }

    // render the events in the subcomponents
    timedSegs = this.timeGrid.renderEvents(timedEvents);
    if (this.dayGrid) {
      daySegs = this.dayGrid.renderEvents(dayEvents);
    }

    // the all-day area is flexible and might have a lot of events, so shift the height
    this.updateHeight();

    View.prototype.renderEvents.call(this, events); // call the super-method
  },

  // Retrieves all segment objects that are rendered in the view
  getSegs: function () {
    return this.timeGrid.getSegs().concat(this.dayGrid ? this.dayGrid.getSegs() : []);
  },

  // Unrenders all event elements and clears internal segment data
  destroyEvents: function () {
    View.prototype.destroyEvents.call(this); // do this before the grids' segs have been cleared

    // if destroyEvents is being called as part of an event rerender, renderEvents will be called shortly
    // after, so remember what the scroll value was so we can restore it.
    this.recordScroll();

    // destroy the events in the subcomponents
    this.timeGrid.destroyEvents();
    if (this.dayGrid) {
      this.dayGrid.destroyEvents();
    }

    // we DON'T need to call updateHeight() because:
    // A) a renderEvents() call always happens after this, which will eventually call updateHeight()
    // B) in IE8, this causes a flash whenever events are rerendered
  },

  /* Event Dragging
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of an event being dragged over the view.
  // A returned value of `true` signals that a mock "helper" event has been rendered.
  renderDrag: function (start, end, seg) {
    if (start.hasTime()) {
      return this.timeGrid.renderDrag(start, end, seg);
    } else if (this.dayGrid) {
      return this.dayGrid.renderDrag(start, end, seg);
    }
  },

  // Unrenders a visual indications of an event being dragged over the view
  destroyDrag: function () {
    this.timeGrid.destroyDrag();
    if (this.dayGrid) {
      this.dayGrid.destroyDrag();
    }
  },

  /* Selection
        ------------------------------------------------------------------------------------------------------------------*/

  // Renders a visual indication of a selection
  renderSelection: function (start, end) {
    if (start.hasTime() || end.hasTime()) {
      this.timeGrid.renderSelection(start, end);
    } else if (this.dayGrid) {
      this.dayGrid.renderSelection(start, end);
    }
  },

  // Unrenders a visual indications of a selection
  destroySelection: function () {
    this.timeGrid.destroySelection();
    if (this.dayGrid) {
      this.dayGrid.destroySelection();
    }
  },
});

/* A week view with an all-day cell area at the top, and a time grid below
    ----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.agendaWeek = AgendaWeekView; // register the view

function AgendaWeekView(calendar) {
  AgendaView.call(this, calendar); // call the super-constructor
}

AgendaWeekView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaWeekView.prototype, {
  name: 'agendaWeek',

  incrementDate: function (date, delta) {
    return date.clone().stripTime().add(delta, 'weeks').startOf('week');
  },

  render: function (date) {
    this.intervalStart = date.clone().stripTime().startOf('week');
    this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

    this.start = this.skipHiddenDays(this.intervalStart);
    this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

    this.title = this.calendar.formatRange(
      this.start,
      this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
      this.opt('titleFormat'),
      ' \u2014 ', // emphasized dash
    );

    AgendaView.prototype.render.call(this, this.getCellsPerWeek()); // call the super-method
  },
});

/* A day view with an all-day cell area at the top, and a time grid below
    ----------------------------------------------------------------------------------------------------------------------*/

fcViews.agendaDay = AgendaDayView; // register the view

function AgendaDayView(calendar) {
  AgendaView.call(this, calendar); // call the super-constructor
}

AgendaDayView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaDayView.prototype, {
  name: 'agendaDay',

  incrementDate: function (date, delta) {
    var out = date.clone().stripTime().add(delta, 'days');
    out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
    return out;
  },

  render: function (date) {
    this.start = this.intervalStart = date.clone().stripTime();
    this.end = this.intervalEnd = this.start.clone().add(1, 'days');

    this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

    AgendaView.prototype.render.call(this, 1); // call the super-method
  },
});

export default () => {};
